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INTERNET-DRAFT J. Loughney
Internet Engineering Task Force Nokia
G. Sidebottom, Guy Mousseau
Issued: 2 July 2000 Nortel Networks
Expires: 2 January 2001 S. Lorusso
Unisphere Solutions
SS7 SCCP-User Adaptation Layer (SUA)
<draft-ietf-sigtran-sua-01.txt>
Status of This Memo
This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC 2026.
Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups. Note that other
groups may also distribute working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as 'work in progress.'
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
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This draft expires on 2 January 2001
Abstract
This Internet Draft defines a protocol for the transport of any SS7
SCCP-User signaling (e.g., TCAP, RANAP, etc.) over IP using the Stream
Control Transport Protocol. The protocol should be modular and
symmetric, to allow it to work in diverse architectures, such as a
Signaling Gateway to IP Signaling Endpoint architecture as well as an
IP Signaling Endpoint to IP Signaling Endpoint. Protocol elements are
added allow seamless operation peers in the SS7 and IP domains.
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
Abstract .............................................................1
1. Introduction ......................................................3
1.1 Scope ..........................................................3
1.2 Terminology ....................................................3
1.3 Signaling Transport Architecture ...............................5
1.4 Services Provided by the SUA Layer .............................9
1.5 Internal Functions Provided in the SUA Layer ..................10
1.6 Definition of SUA Boundaries ..................................11
2 Protocol Elements .................................................11
2.1 Common Message Header .........................................11
2.2 SUA Connectionless Messages ...................................13
2.3 Connection Oriented Messages ..................................15
2.4 SS7 Signaling Network Management Messages .....................19
2.5 Application Server Process Maintenance Messages ...............23
2.6 Management Messages ...........................................27
2.7 Vendor Specific Message .......................................29
2.8 Fixed Length Parameters .......................................30
2.9 Variable Length Paramters .....................................34
3 Procedures ........................................................36
3.1 Peer Message Procedures .......................................36
3.2 Signaling Gateway Related Procedures ..........................36
3.3 Layer Management Procedures ...................................36
3.4 SCTP Management Procedures ....................................36
4 Examples of SUA Procedures ........................................41
4.1 Establishment of Association ..................................41
4.2 ASP fail-over Procedures ......................................41
4.3 SUA/SCCP-User Boundary Examples ...............................42
5 Security ..........................................................42
5.1 Introduction ..................................................42
5.2 Threats .......................................................42
5.3 Protecting Confidentiality ....................................43
6 IANA Considerations ...............................................43
6.1 SCTP Protocol ID ..............................................43
6.2 Port Number ...................................................43
7 Timer Values ......................................................43
8 Acknowledgements ..................................................43
9 Authors' Addresses ................................................43
10 References .......................................................44
Appendix A: Message mapping between SCCP and SUA. ...................45
Copyright Statement .................................................45
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
1. Introduction
1.1 Scope
There is on-going integration of SCN networks and IP networks.
Network service providers are designing all IP architectures which
include support for SS7 and SS7-like signaling protocols. In these
networks, they may be some need for interworking between the SS7 and
IP domains. IP provides an effective way to transport user data and
for operators to expand their networks and build new services.
This document details the delivery of SCCP-user messages (MAP & CAP
over TCAP, RANAP, etc.) and new third generation network protocol
messages over IP between two signaling endpoints. Consideration is
given for the transport from an SS7 Signaling Gateway (SG) to an IP
signaling node (such as an IP-resident Database) as described in the
Framework Architecture for Signaling Transport [2719]. This protocol
can also support transport of SCCP-user messages between two endpoints
wholly contained within an IP network.
The delivery mechanism SHOULD meet the following criteria:
* Support for transfer of SS7 SCCP-User Part messages (e.g., TCAP,
RANAP, etc.)
* Support for SCCP connectionless service.
* Support for SCCP connection oriented service.
* Support for the seamless operation of SCCP-User protocol peers
* Support for the management of SCTP transport associations between a
SG and one or more IP-based signaling nodes).
* Support for distributed IP-based signaling nodes.
* Support for the asynchronous reporting of status changes to
management
The protocol is modular in design, allowing different implementations
to be made, based upon the environment that needs to be supported.
Depending upon the upper layer protocol supported, the SUA will need
to support SCCP connectionless service, SCCP connect-orient service or
both services.
1.2 Terminology
Signaling Gateway (SG) - Network element that terminates SCN signaling
and transports SCCP-User signaling over IP to an IP signaling
endpoint. A Signaling Gateway could be modeled as one or more
Application Servers, which is located at the border of the SS7 and IP
networks.
Application Server (AS) - A logical entity serving a specific Routing
Key. An example of an Application Server is a virtual switch element
handling all call processing for a unique set of SCCP-users. The AS
contains a set of one or more unique Application Server Processes, of
which one or more is normally actively processing traffic.
Application Server Process (ASP) - An Application Server Process
serves as an active or standby process of an Application Server (e.g.,
part of a distributed signaling node or database element). Examples
of ASPs are MGCs, IP SCPs, or IP-based HLRs. An ASP contains an SCTP
end-point and may be configured to process traffic within more than
one Application Server.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
Association - An association refers to an SCTP association. The
association provides the transport for the delivery of SCCP-User
protocol data units and SUA adaptation layer peer messages.
Routing Key - The Routing Key describes a set of SS7 parameter and /or
parameter-ranges that uniquely defines the range of signaling traffic
configured to be handled by a particular Application Server. An
example would be where a Routing Key consists of a particular DPC and
SSN to which all traffic would be directed to a particular Application
Server. Routing Keys are mutually exclusive in the sense that a
received SS7 signaling message cannot be directed to more than one
Routing Key. A Routing Key cannot extend across more than a single
SS7 DPC, in order to more easily support SS7 Management procedures. It
is not necessary for the parameter ranges within a particular Routing
Key to be contiguous.
Routing Context - An Application Server Process may be configured to
process traffic within more than one Application Server. In this
case, the Routing Context parameter is exchanged between two ASPs,
identifying the relevant Application Server. From the perspective of
an ASP, the Routing Context uniquely identifies the range of traffic
associated with a particular Application Server, which the ASP is
configured to receive. There is a 1:1 relationship between a Routing
Context value and a Routing Key within an AS. Therefore the Routing
Context can be viewed as an index into an AS Table containing the AS
Routing Keys.
Fail-over - The capability to re-route signaling traffic as required
to an alternate Application Server Process, or group of ASPs, within
an Application Server in the event of failure or unavailability of a
currently used Application Server Process. Fail-back may apply upon
the return to service of a previously unavailable Application Server
Process.
Signaling Point Management Cluster (SPMC) - A complete set of
Application Servers represented to the SS7 network under the same SS7
Point Code. SPMCs are used to sum the availability / congestion /
User_Part status of an SS7 destination point code that is distributed
in the IP domain, for the purpose of supporting management procedures
at an SG.
Network Appearance - The Network Appearance identifies an SS7 network
context for the purposes of logically separating the signaling traffic
between the SG and the Application Server Processes over a common SCTP
Association. An example is where an SG is logically partitioned to
appear as an element in four separate national SS7 networks. A
Network Appearance implicitly defines the SS7 Point Code(s), Network
Indicator and MTP3 protocol type/variant/version used within a
specific SS7 network partition. An physical SS7 route-set or link-set
at an SG can appear in only one network appearance. The Network
Appearance is not globally significant and requires coordination only
between the SG and the ASP.
Network Byte Order - Most significant byte first, a.k.a. Big Endian.
Layer Management - Layer Management is a nodal function in an SG or
ASP that handles the inputs and outputs between the SUA layer and a
local management entity.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
Host - The computing platform that the ASP process is running on.
Stream - A stream refers to an SCTP stream; a uni-directional logical
channel established from one SCTP endpoint to another associated SCTP
endpoint, within which all user messages are delivered in-sequence
except for those submitted to the un-ordered delivery service.
Transport address - an address which serves as a source or destination
for the unreliable packet transport service used by SCTP. In IP
networks, a transport address is defined by the combination of an IP
address and an SCTP port number. Note, only one SCTP port may be
defined for each endpoint, but each SCTP endpoint may have multiple IP
addresses.
1.3 Signaling Transport Architecture
The framework architecture that has been defined for SCN signaling
transport over IP [2719] uses multiple components, including an IP
transport protocol, a signaling common transport protocol and an
adaptation module to support the services expected by a particular SCN
signaling protocol from its underlying protocol layer.
In general terms, the architecture can be modeled as a peer-to-peer
architecture.
1.3.1 Protocol Architecture for TCAP Transport
In this architecture, the SCCP and SUA layers interface in the SG.
There needs to be interworking between the SCCP and SUA layers to
provide for the seamless transfer of the user messages as well as the
management messages. The SUA handles the SS7 address to IP address
mapping.
******** SS7 *************** IP ********
* SEP *---------* *--------* *
* or * * SG * * ASP *
* STP * * * * *
******** *************** ********
+------+ +------+
| TCAP | | TCAP |
+------+ +------+------+ +------+
| SCCP | | SCCP | SUA | | SUA |
+------+ +------+------+ +------+
| MTP3 | | MTP3 | | | |
+------| +------+ SCTP | | SCTP |
| MTP2 | | MTP2 | | | |
+------+ +------+------+ +------+
| L1 | | L1 | IP | | IP |
+------+ +------+------+ +------+
| | | |
+---------------+ +------------+
TCAP - Transaction Capability Application Protocol
STP - SS7 Signaling Transfer Point
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
1.3.2 Protocol Architecture for RANAP Transport
In this architecture, the SS7 application protocol is invoked at the
SG. For messages destined for an ASP, the SUA handles address
translation, for example by way of Global Title Translation or via
mapping table, resolving the destination specified by SS7 Application
to a SCTP association / IP address.
******** SS7 *************** IP ********
* SEP *---------* *--------* *
* or * * SG * * ASP *
* STP * * * * *
******** *************** ********
+------+ +-------------+ +------+
| S7AP | | S7AP | | S7AP |
+------+ +------+------+ +------+
| SCCP | | SCCP | SUA | | SUA |
+------+ +------+------+ +------+
| MTP3 | | MTP3 | | | |
+------| +------+ SCTP | | SCTP |
| MTP2 | | MTP2 | | | |
+------+ +------+------+ +------+
| L1 | | L1 | IP | | IP |
+------+ +------+------+ +------+
| | | |
+---------------+ +------------+
S7AP - SS7 Application Protocol (e.g. - RANAP/RNSAP)
STP - SS7 Signaling Transfer Point
This architecture may simplify, in some cases, to carrying an SS7
application protocol between two IP based endpoints. In this
scenario, full SG functionality may not be needed. This architecture
is considered in the next section.
1.3.3 All IP Architecture
******** IP ********
* *--------* *
* AS * * AS *
* * * *
******** ********
+------+ +------+
| AP | | AP |
+------+ +------+
| SUA | | SUA |
+------+ +------+
| SCTP | | SCTP |
+------+ +------+
| IP | | IP |
+------+ +------+
| |
+----------------+
AP - Application Protocol (e.g. - RANAP/RNSAP)
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
This architecture can be used to carry a protocol which uses the
transport services of SCCP, but is contained with an IP network. This
allows extra flexibility in developing networks, especially when
interaction between legacy signaling is not needed. The architecture
removes the need for signaling gateway functionality.
In the case where a collision occurs during initiation, there exist
two possible solutions: 1) if there are sufficient resources, both
initiations could be accepted; 2) both ASPs should back-off and after
some amount of time, later re-establish an initiation.
1.3.4 Generalized Point-to-Point Network Architecture
Figure 1 shows an example network architecture which can support
robust operation and failover support. There needs to be some
management resources at the AS to manage traffic.
In this example, the Application Servers are shown residing within one
logical box, with ASPs located inside. In fact, an AS could be
distributed among several hosts. In such a scenario, the host should
share state as protection in the case of a failure. Additionally, in
a distributed system, one ASP could be registered to more than one AS.
This draft should not restrict such systems - though such a case in
not specified.
***********
* AS1 *
* +-----+ * SCTP Associations
* |ASP1 +-------------------+
* +-----+ * | ***********
* * | * AS3 *
* +-----+ * | * +-----+ *
* |ASP2 +-----------------------------------------+ASP1 | *
* +-----+ * | * +-----+ *
* * | * *
* +-----+ * | * +-----+ *
* |ASP3 | * +--------------------------+ASP2 | *
* +-----+ * | | * +-----+ *
*********** | | ***********
| |
*********** | | ***********
* AS2 * | | * AS4 *
* +-----+ * | | * +-----+ *
* |ASP1 +--------------+ +---------------------+ASP1 | *
* +-----+ * * +-----+ *
* * * *
* +-----+ * * +-----+ *
* |ASP2 +-----------------------------------------+ASP1 | *
* +-----+ * * +-----+ *
* * ***********
* +-----+ *
* |ASP3 | *
* +-----+ *
* *
***********
Figure 1: Generalized Architecture
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
1.3.5 Generalized Signaling Gateway Network Architecture
When interworking between SS7 and IP domains is needed, the SG acts as
the gateway node between the SS7 network and the IP network. The SG
will transport SCCP-user signaling traffic from the SS7 network to the
IP-based signaling nodes (for example IP-resident Databases). The
Signaling Gateway can be considered as a group of Application Servers
with additional functionality to interface towards an SS7 network.
The SUA protocol should be flexible enough to allow different
configurations and transport technology to allow the network operators
to meet their operation, management and performance requirements.
Figure 2 shows a possible realization of this architecture, with
Signaling Gateway functionality.
Signaling Gateway
****************
* +----------+ * **************
* | AS1 | * * AS3 *
* | ******** | * * ******** *
* | * ASP1 +---------------------------------------------+ ASP1 * *
* | ******** | * * ******** *
* | ******** | * * ******** *
* | * ASP2 +--------------------------+ +----------+ ASP2 * *
* | ******** | * | | * ******** *
* +----------+ * | | * . *
* +----------+ * | | * . *
* | AS2 | * | | * . *
* | ******** | * | | * ******** *
* | * ASP1 +----------------------------------+ * * ASPN * *
* | ******** | * SCTP Associations | * ******** *
* | ******** | * | **************
* | * ASP2 +---------------- |
* | ******** | * | | **************
* +----------+ * | | * AS4 *
**************** | | * ******** *
| +------------------+ ASP1 * *
| * ******** *
| * . *
| * . *
| * *
| * ******** *
+-----------------------------+ ASPn * *
* ******** *
**************
Figure 2: Signaling Gateway Architecture
1.3.6 ASP Fail-over Model and Terminology
The SUA protocol supports ASP fail-over functions in order to support
a high availability of transaction processing capability.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
An Application Server can be considered as a list of all ASPs
configured/registered to handle SCCP-user messages within a certain
range of routing information, known as a Routing Key. One or more
ASPs in the list may normally be active to handle traffic, while
others may while any others are inactive but available in the event
of failure or unavailability of the active ASP(s).
The fail-over model supports an "n+k" redundancy model, where "n" ASPs
is the minimum number of redundant ASPs required to handle traffic and
"k" ASPs are available to take over for a failed or unavailable ASP.
Note that "1+1" active/standby redundancy is a subset of this model. A
simplex "1+0" model is also supported as a subset, with no ASP
redundancy.
To avoid a single point of failure, it is recommended that a minimum
of two ASPs be resident in the list, resident in separate physical
hosts and therefore available over different SCTP Associations.
1.4 Services Provided by the SUA Layer
1.4.1 Support for the transport of SCCP-User Messages
The SUA needs to support the transfer of SCCP-user messages. The SUA
layer at the SG needs to seamlessly transport the user messages.
1.4.2 SCCP Protocol Class Support
Depending upon the SCCP-users supported, the SUA shall support the 4
possible SCCP protocol classes transparently. The SCCP protocol
classes are defined as follows:
* Protocol class 0 provides unordered transfer of SCCP-user
messages in a connectionless manner.
* Protocol class 1 allows the SCCP-user to select the in-
sequence delivery of SCCP-user messages in a connectionless
manner.
* Protocol class 2 allows the bi-directional transfer of SCCP-
user messages by setting up a temporary or permanent signaling
connection.
* Protocol class 3 allows the features of protocol class 2 with
the inclusion of flow control. Detection of message loss or
mis-sequencing is included.
Protocol classes 0 and 1 make up the SCCP connectionless service.
Protocol classes 2 and 3 make up the SCCP connection-oriented service.
1.4.3 Native Management Functions
The SUA layer may provide management of the underlying SCTP layer to
ensure that transport is available according to the degree specified
by the SCCP-user application.
The SUA layer provides the capability to indicate errors associated
with the SUA-protocol messages and to provide notification to local
management and the remote peer as is necessary.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
1.4.4 Interworking with SCCP Network Management Functions
The SUA layer needs to support the following SCCP network management
functions:
Coord Request
Coord Indication
Coord Response
Coord Confirm
State Request
State Indication
Pcstate Indication
1.4.5 Support for the management between the SG and ASP.
The SUA layer should provide interworking with SCCP management
functions at the SG for seamless inter-operation between the SCN
network and the IP network. It should:
*Provide an indication to the SCCP-user at an ASP that a remote SS7
endpoint/peer is unreachable.
*Provide an indication to the SCCP-user at an ASP that a remote SS7
endpoint/peer is reachable.
*Provide congestion indication to SCCP-user at an ASP.
*Provide the initiation of an audit of remote SS7 endpoints at the
SG.
1.5 Internal Functions Provided in the SUA Layer
1.5.1 Address Translation and Mapping at the SG
SCCP users may present the following options to address their peer
endpoints:
Global Title
DPC + SSN
Host Name
IP Address(es)
Global Titles are an interesting option for addressing. Currently,
the ITU does not support translation of Global Titles to IP addresses.
However, IP addresses are global in scope. There exist many
proprietary schemes for managing SS7 Address Translation to IP
addresses, and is considered outside of the scope of this document to
specify how this is done.
That being said, currently, there is some work within the IETF
studying translation of E.164 numbers to Host Names [ENUMS], [E.164-
DNS]. Some discussion of address translation should be made to insure
interoperability between implementations of the SUA. For further
instruction in the use of Global Titles the rules detailed in Annex B
of ITU Q.713 [ITU SCCP] or [ANSI SCCP] should be consulted.
In many cases, the network operator may have some control over the
SCCP-user protocols being transported by SUA. If possible, the Upper
Layer can present a Host Name or IP Address, which then can be
directly passed to SCTP.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
1.5.2 SCTP Stream Mapping
The SUA supports SCTP streams. The SG/AS needs to maintain a list of
SCTP and SUA-users for mapping purposes. SCCP-users requiring
sequenced message transfer need to be sent over a stream supporting
sequenced delivery.
SUA MUST use stream 0 for SUA management messages. It is recommended
that sequenced delivery be in order to preserve the order of
management message delivery.
1.6 Definition of SUA Boundaries
1.6.1 Definition of the upper boundary
The following primitives are supported between the SUA and an SCCP-
user.
Connect Request
Connect Indication
Connect Responding
Connect Confirm
Data Request
Data Indication
Expedited Data Request
Expedited Data Indication
Disconnect Request
Disconnect Indication
Reset Request
Reset Indication
Reset Response
Reset Confirm
1.6.2 Definition of the lower boundary
The upper layer primitives provided by the SCTP are provided in
[SCTP].
2 Protocol Elements
The general message format includes a Common Message Header together
with a list of zero or more parameters as defined by the Message Type.
For forward compatibility, all Message Types may have attached
parameters even if none are specified in this version.
2.1 Common Message Header
The protocol messages for the SCCP-User Adaptation Protocol requires a
message structure which contains a version, message type, message
length and message contents. This message header is common among all
signaling protocol adaptation layers:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ver | Spare | Message Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Length |A| B | C |D|X| Hop Counter |
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Address Ptr | Destination Address Ptr |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mandatory Parameters Ptr | Optional Parameters Ptr |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.1.1 SUA Protocol Version
The version field (ver) contains the version of the SUA adaptation
layer. The supported versions are:
01 SUA version 1.0
2.1.2 Message Types
Connectionless Messages
Connectionless Data Transfer (CLDT) 0x0501
Connectionless Data Acknowledge (CLDA) 0x0502
Connection-Oriented Messages
Connection Request (CORE) 0x0701
Connection Acknowledge (COAK) 0x0702
Release Request (RELRE) 0x0703
Release Complete (RELCO) 0x0704
Reset Confirm (RESCO) 0x0705
Reset Request (RESRE) 0x0706
Connection Oriented Data Transfer (CODT) 0x0707
Connection Oriented Data Acknowledge (CODA) 0x0708
Application Server Process Maintenance (ASPM) Messages
ASP Up (ASPUP) 0x0301
ASP Down (ASPDN) 0x0302
Heartbeat(BEAT) 0x0303
ASP Active (ASPAC) 0x0401
ASP Inactive (ASPIA) 0x0402
Notify (NTFY) 0x0404
SUA Management Messages
Error (ERR) 0x0000
Audit (AUD) 0x0001
SS7 Signaling Network Management (SSNM) Messages
Destination Unavailable (DUNA) 0x0201
Destination Available (DAVA) 0x0202
Destination State Audit (DAUD) 0x0203
SS7 Network Congestion State (SCON) 0x0204
Vendor-Specific Message (VEN) 0xFFFE
2.1.3 Message Length
The Message Length defines the length of the message in octets,
including the header.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
2.1.4 Flags
A Error Return option
Value Description
0x0 No error message
0x1 Return message on error
B Protocol class
Value Description
0x0 Class 0 (connectionless service)
0x1 Class 1 (connectionless service)
0x2 Class 2 (connection-oriented service)
0x3 Class 3 (connection-oriented service
C priority
Value Description
0x0 Least important
:
0x7 Highest importance
D segmentation
Value Description
0x0 No segmentation
0x1 Segmentation
E Hop Counter
Value Description
0x0
:
0x15 Maximum number of GTT
0x16
: Spare
0x255
2.1.5 Pointer Usage
The pointer will point to the byte at the start of the parameter. If
the pointer value is 0, then the parameter is not present in the
message.
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+---------------+---------------+
| Pointer MSB | Pointer LSB |
+---------------+---------------+
/ . . . /
\ \
+---------------+---------------+
| X + Pointer | |
+---------------+---------------+
2.2 SUA Connectionless Messages
The following section describes the SUA Connectionless transfer
messages and parameter contents. The general message format includes
a Common Message Header together with a list of zero or more
parameters as defined by the Message Type. All Message Types can have
attached parameters.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
2.2.1 Connectionless Data Transfer
This message transfers data between one SUA to another.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Variable Length Parameters
Originating Address Mandatory
Destination Address Mandatory
Data Mandatory
Implementation note:
This message covers the following SCCP messages: unitdata (UDT),
extended unitdata (XUDT), long unitdata (LUDT).
2.2.2 Connectionless Data Acknowledge
This message is used to acknowledge receipt of data by the peer and/or
report errors.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
Loughney, et al. [Page 14]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Variable Length Parameters
Originating Address Mandatory
Destination Address Mandatory
Data Optional
Fixed Length Parameters
Cause Mandatory
Implementation note:
This message covers the following SCCP messages: protocol data unit
error (ERR), long unitdata service (LUDTS), unitdata service (UDTS),
extended unitdata service (XUDTS).
2.3 Connection Oriented Messages
2.3.1 Connection Oriented Data Transfer
This message transfers data between one SUA to another for connection
oriented service.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Sequence number Optional
Destination Reference Number Mandatory
Variable Length Parameters
Data Mandatory
Implementation note:
This message covers the following SCCP messages: data form 1 (DT1),
data form 2 (DT2), expedited data (ED).
2.3.2 Connection Oriented Data Acknowledge
This message is used to acknowledge receipt of data by the peer and/or
report errors.
0 1 2 3
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Sequence number Optional
Destination Reference Number Mandatory
Implementation note:
This message covers the following SCCP messages: data acknowledgement
(AK), expedited data acknowledgement (EA).
2.3.3 Connect Request
This message is used for establishing a signaling connection between
two peer endpoints. This is used for connection oriented service.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Source Reference Number Mandatory
Variable Length Parameters
Data Optional
2.3.4 Connection Acknowledge
This message is used to acknowledge and/or refuse a connection request
between to peer endpoints.
Loughney, et al. [Page 16]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Destination Reference Number Mandatory *1
Source Reference Number Mandatory *1
Cause Mandatory *2
Variable Length Parameters
Data Optional
*1 Mandatory for connection confirmation, it is not needed in the case
that the connection is refused.
*2 Mandatory in the case that the connection is refused.
Implementation note:
This message covers the following SCCP messages: connection confirm
(CC), connection refused (CREF).
2.3.5 Release Request
This message is used to request a signaling connection between two
peer endpoints be released. All associated resources can then be
released.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Destination Reference Number Mandatory
Source Reference Number Mandatory
Cause Mandatory
Variable Length Parameters
Data Optional
2.3.6 Release Complete
This message is used to acknowledge the release of a signaling
connection between two peer endpoints. All associated resources
should be released.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Destination Reference Number Mandatory
Source Reference Number Mandatory
2.3.7 Reset Request
This message is used to indicate that the sending SCCP/SUA wants to
initiate a reset procedure (re-initialization of sequence numbers)
the peer endpoint.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. [Page 18]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Destination Reference Number Mandatory
Source Reference Number Mandatory
Cause Mandatory
2.3.8 Reset Confirm
This message is used to confirm the Reset Request.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Destination Reference Number Mandatory
Source Reference Number Mandatory
2.4 SS7 Signaling Network Management Messages
2.4.1 Destination Unavailable
The DUNA message is sent from the SG to all concerned ASPs to indicate
that the SG has determined that an SS7 destination is unreachable.
The SUA-User at the ASP is expected to stop traffic to the affected
destination through the SG initiating the DUNA.
The format for DUNA Message parameters is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| protocol id |
Loughney, et al. [Page 19]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| network appearance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Protocol ID Optional
Network Appearance Optional
Variable Length Parameters
Source Address Mandatory
Destination Address Mandatory
Info String Optional
Note: The Source Address refers to the address of the sender of the
DUNA. The Destination Address refers to the address of the
unreachable destination.
2.4.2 Destination Available
The DAVA message is sent from the SG to all concerned ASPs to indicate
that the SG has determined that an SS7 destination is now reachable.
The ASP MTP3-User protocol is expected to resume traffic to the
affected destination through the SG initiating the DUNA.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| protocol id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| network appearance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Loughney, et al. [Page 20]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
Protocol ID Optional
Network Appearance Optional
Variable Length Parameters
Source Address Mandatory
Destination Address Mandatory
Info String Optional
Note: The Source Address refers to the address of the sender of the
DAVA. The Destination Address refers to the address of the
destination which is now reachable.
2.4.3 Destination State Audit
The DAUD message can be sent from the ASP to the SG to query the
availability state of the SS7 routes to an affected destination. A
DAUD may be sent periodically after the ASP has received a DUNA,
until a DAVA is received. The DAUD can also be sent when an ASP
recovers from isolation from the SG.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| protocol id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| network appearance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Protocol ID Optional
Network Appearance Optional
Variable Length Parameters
Source Address Mandatory
Destination Address Mandatory
Info String Optional
Note: The Source Address refers to the address of the sender of the
DAUD. The Destination Address refers to the address of the
destination who's state is being audited.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
2.4.4 SS7 Network Congestion
The SCON message can be sent from the SG to all concerned ASPs to
indicate that the congestion level in the SS7 network to a specified
destination has changed.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| protocol id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| network appearance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| congestion level |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Protocol ID Optional
Network Appearance Optional
Congestion Level Optional
Variable Length Parameters
Source Address Mandatory
Destination Address Mandatory
Info String Optional
Note: The Source Address refers to the address of the sender of the
SCON. The Destination Address refers to the address of the
unreachable destination.
Implementation note:
This message covers the following SCCP message: subsystem congested
(SSC).
Loughney, et al. [Page 22]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
2.5 Application Server Process Maintenance Messages
2.5.1 ASP Up (ASPUP)
The ASP UP (ASPUP) message is used to indicate to a remote SUA peer that
the Adaptation layer is ready to receive traffic or maintenance
messages.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ASP Capabilities |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ALI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
ASP Capabilities Manditory (see section 2.8.10)
Adaptation Layer Identifier Optional
Variable Length Parameters
Info String Optional
2.5.2 ASP Down (ASPDN)
The ASP Down (ASPDN) message is used to indicate to a remote SUA peer
that the adaptation layer is not ready to receive traffic or maintenance
messages.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. [Page 23]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| reason code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Reason Code Mandatory
Variable Length Parameters
Info String Optional
The Reason parameter indicates the reason that the remote SUA
adaptation layer is unavailable. The valid values for Reason are
shown in the following table.
Value Description
0x1 Processor Outage
0x2 Management Inhibit
Implementation note:
This message covers the following SCCP message: subsystem-prohibited
(SSP).
2.5.3 Heartbeat (BEAT)
The Heartbeat message is optionally used to ensure that the SUA peers
are still available to each other. It is recommended for use when the
SUA runs over a transport layer other than the SCTP, which has its own
heartbeat.
The BEAT message contains no parameters.
2.5.4 ASP Active (ASPAC)
The ASPAC message is sent by an ASP to indicate to an SG/AS that it is
Active and ready to be used.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Loughney, et al. [Page 24]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Variable Length Parameters
Routing Context Mandatory
Info String Optional
Implementation note:
This message covers the following SCCP message: subsystem-allowed
(SSA).
2.5.5 ASP Inactive (ASPIA)
The ASPIA message is sent by an ASP to indicate to an SG/AS that it is
no longer an active ASP to be used from within a list of ASPs. The
SG/AS will respond with an ASPIA message and either discard incoming
messages or buffer for a timed period and then discard.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Variable Length Parameters
Routing Context Optional
Info String Optional
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Implementation note:
This message covers the following SCCP message: subsystem-out-of-
service-request (SOR).
2.5.6 ASP Inactive Ack (ASPIAK)
The ASPIAK message is sent by the SG/AS in response to an ASPIA to the
sending ASP that it acknowledges the ASPIA.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Variable Length Parameters
Routing Context Optional
Info String Optional
Implementation note:
This message covers the following SCCP message: subsystem-out-of-
service-grant (SOG).
2.5.7 Notify (NTFY)
The NTFY message is sent by an AS to indicate any change of status in
the AS or ASP to an ASP. AS sends this message to all concerned
endpoints.
The format for the NTFY message parameters is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Status |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The NTFY message contains the following parameters:
Fixed Length Parameters
Status Type Mandatory
Variable Length Parameters
Routing Context Optional
Info String Optional
2.6 Management Messages
These messages are used for managing SUA and the representations of
the SCCP subsystems in the SUA layer.
2.6.1 Error (ERR)
The ERR message is sent when an invalid value is found in an incoming
message.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ver | Spare | Message Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Length |A| B | C |D|X| Hop Counter |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Address Ptr | Destination Address Ptr |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Mandatory Parameters Ptr | Optional Parameters Ptr |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Cause |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Fixed Length Parameters
Cause Mandatory
Variable Length Parameters
Source Address Mandatory
Destination Address Mandatory
Data Optional
The Error Code can be one of the following values:
Invalid Version 0x1
Invalid Network Appearance 0x2
Invalid SCN Version 0x3
Invalid Adaptation Layer Identifier 0x4
Invalid Stream Identifier 0x5
Invalid Message Type 0x6
2.6.2 Audit
This message is used to audit the current state of the peer endpoint.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Variable Length Parameters
Source Address Mandatory
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
Destination Address Mandatory
Data Optional
Implementation note:
This message covers the following SCCP messages: inactivity test (IT),
subsystem-status-test (SST).
2.7 Vendor Specific Message
This is to allow vendors to support their own extended message not
defined by the IETF. It MUST not affect the operation of the SUA.
Endpoints not equipped to interpret the vendor-specific messages sent
by a remote endpoint MUST ignore it (although it may be reported).
Endpoints that do not receive desired vendor-specific information
SHOULD make an attempt to operate without it, although they may do so
(and report they are doing so) in a degraded mode.
A summary of the Vendor-specific extension format is shown below. The
fields are transmitted from left to right.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Message Type = 0xFFFE | Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Vendor-Id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\ \
/ Parameter Value /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: 16 bit u_int
0xFFFE for all Vendor-Specific parameters.
Length: 16 bit u_int
Indicate the size of the parameter in octets, including the
Type, Length, Vendor-Id, and Value fields.
Vendor-Id: 32 bit u_int
The high-order octet is 0 and the low-order 3 octets are the
SMI Network Management Private Enterprise Code of the Vendor
in network byte order, as defined in the Assigned Numbers (RFC
1700).
Value: variable length
The Value field is one or more octets. The actual format of the
information is site or application specific, and a robust
implementation SHOULD support the field as undistinguished
octets.
The codification of the range of allowed usage of this field is
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
outside the scope of this specification.
It SHOULD be encoded as a sequence of vendor type / vendor length
/ value fields, as follows. The parameter field is dependent on
the vendor's definition of that attribute. An example encoding
of the Vendor-Specific attribute using this method follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Parameter Type = 0xFFFE | Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Vendor-Id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| VS-Type | VS-Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ VS-Value /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
VS-Type: 16 bit u_int
This field identifies the parameter included in the VS-Value
field. It is assigned by the vendor.
VS-Length: 16 bit u_int
This field is the length of the vendor-specific parameter and
includes the VS-Type, VS-Length and VS-Value (if included)
fields.
VS-Value: Variable Length
This field contains the parameter identified by the VS-Type
field. It's meaning is identified by the vendor.
2.8 Fixed Length Parameters
Parameter Name Parameter ID
============== ============
Sequence Number 0x0002
Source Reference Number 0x0003
Destination Reference Number 0x0004
Cause 0x0007
Protocol Identifier 0x0008
Network Appearance 0x0009
Congestion Level 0x000C
Adaptation Layer Identifier 0x000D
ASP ID 0x000E
ASP Capabilities 0x000F
Status 0x0010
2.8.1 Sequence Number
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.8.2 Source Reference Number
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.8.3 Destination Reference Number
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination reference number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.8.4 Cause
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| reason code |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Reason code may be one of the following reasons:
Invalid Version 0x1
Invalid Network Appearance 0x2
Invalid SCN Version 0x3
Invalid Adaptation Layer Identifier 0x4
Invalid Stream Identifier 0x5
Invalid Message Type 0x6
2.8.5 Protocol Identifier
The Protocol Identifier parameter identifies the SCCP version/variant.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| protocol id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.8.6 Network Appearance
The Network Appearance parameter identifies the SS7 network context
for the message, for the purposes of logically separating the
signaling traffic between the SG and the Application Server Processes
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over common SCTP Associations. An example is where an SG is logically
partitioned to appear as an element in four different national SS7
networks. A Network Appearance implicitly defines the SS7 Destination
Point Code used, the SS7 Network Indicator value and SCCP/SCCP-User
protocol type/variant/version used within the SS7 network partition.
Where an SG operates in the context of a single SS7 network, or
individual SCTP associations are dedicated to each SS7 network
appearance, the Network Appearance parameter is not required.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| network appearance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.8.7 Congestion Level
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| congestion level |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The valid values for the optional Congestion Level parameter are shown
in the following table.
Value Description
00 No Congestion or Undefined
01 Congestion Level 1
02 Congestion Level 2
03 Congestion Level 3
2.8.8 Adaptation Layer Identifier
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ALI |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The optional Adaptation Layer Identifier (ALI) is a string that
identifies the adaptation layer. This string MUST be set to "SUA" which
results in a length of 3. The ALI would normally only be used in the
initial ASP Up message across a new SCTP association to ensure both
peers are assuming the same adaptation layer protocol.
2.8.9 ASP ID
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ASP ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.8.10 ASP Capabilities
This parameter is used so that the ASP can report it's capabilities
for supporting different protocol classes and interworking scenarios.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1|0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| reserved |0 0 0 0|a|b|c|d| interworking |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Flags
a - Protocol Class 3
b - Protocol Class 2
c - Protocol Class 1
d - Protocol Class 0
0 indicates no support for the Protocol Class.
Interworking
Values
0x0 indicates no interworking with SS7 Networks.
0x1 indicates IP Signaling Endpoint.
0x2 indicates Signaling Gateway.
2.8.11 Status
This parameter is used so that the ASP can report it's capabilities
for supporting different protocol classes and interworking scenarios.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Status Type | Status Id |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Status Type parameter identifies the type of the status that is
being notified. The valid values are shown in the following table.
Value Description
0x1 AS_STATE_CHANGE
0x2 ASP_STATE_CHANGE
The Status Id parameter identifies the status that is being notified.
The valid values are shown in the following table.
If the Status Type is AS_STATE_CHANGE
Value Description
0x1 AS_DOWN
0x2 AS_UP
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0x3 AS_PART_ACTIVE
0x4 AS_ACTIVE
0x5 AS_PENDING
If the Status Type is ASP_STATE_CHANGE
Value Description
0x1 ASP_DOWN
0x2 ASP_UP
0x3 ASP_ACT_NEW
0x4 ASP_ACT_OLD
0x5 AS_ACTIVE
2.9 Variable Length Paramters
Parameter Name Parameter ID
============== ============
Data 0x0001
Source Address 0x0005
Destination Address 0x0006
Info String 0x000A
Routing Context 0x000B
2.9.1 Data
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ data /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.9.2 Source Address (=CLG)
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type of Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Source Address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type of Address field is used to aid in the identification of the
type of address. If this field is set to 0, then the address field
needs to be analized.
Type of Address
Unknown/Undeterminable 0x00000000
SS7 Point Code 0x00000001
Global Title 0x00000002
Host Name 0x00000003
IPv4 Address 0x00000004
IPv6 Address 0x00000005
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2.9.3 Destination Address (=CLD)
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0| Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type of Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ destination address /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type of Address field is used to aid in the identification of the
type of address. If this field is set to 0, then the address field
needs to be analized.
Type of Address
Unknown/Undeterminable 0x00000000
SS7 Point Code 0x00000001
Global Title 0x00000002
Host Name 0x00000003
IPv4 Address 0x00000004
IPv6 Address 0x00000005
2.9.4 Info String
The INFO String parameter can carry any meaningful 8-BIT ASCII
character string along with the message. Length of the INFO String
parameter is from 0 to 255 characters. No procedures are presently
identified for its use but the INFO String may be used by Operators
for debugging purposes.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ info string /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2.9.5 Routing Context
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0| length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ Routing Context /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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The Type parameter identifies the message as an Over-ride or Load-
share Active message. The valid values for Type are shown in the
following table.
Value Description
0x1 Over-ride
0x2 Load-share
Within a particular Routing Context, only one Type can be used.
The optional Routing Context parameter contains (a list of) integers
indexing the Application Server traffic that the sending ASP is
configured to receive. There is one-to-one relationship between an
index entry and an AS Name. Because an AS can only appear in one
Network Appearance, the Network Appearance parameter is not required
in the ASPAC message
An Application Server Process may be configured to process traffic for
more than one logical Application Server. From the perspective of an
ASP, a Routing Context defines a range of signaling traffic that the
ASP is currently configured to receive from the SG.
3 Procedures
The SUA layer needs to respond to various local primitives it receives
from other layers as well as the messages that it receives from the
peer SUA layers. This section describes the SCU procedures in
response to these events.
3.1 Peer Message Procedures
On receiving a message, the SUA layer performs address translation and
mapping (if needed), to determine the appropriate Application Server
Process (ASP). The appropriate ASP can be determined based on the
information in the incoming message, local load sharing information,
etc. The appropriate SUA message is then constructed and sent to the
appropriate endpoint, via the correct SCTP association.
3.2 Signaling Gateway Related Procedures
These support the SUA transport of SCCP-User/SCCP boundary primitives.
On receiving a SCCP message at the SG, the SUA layer performs address
translation and mapping, to determine the appropriate Application
Server Process (ASP). The appropriate ASP can be determined based on
the information in the incoming message, local load sharing
information, etc. The appropriate SUA message is then constructed and
sent to the appropriate endpoint, via the correct SCTP association.
The SUA needs to setup and maintain the appropriate SCTP association
to the selected endpoint. SUA also manages the usage SCTP streams.
3.3 Layer Management Procedures
The SUA layer needs to send and receive layer management messages.
3.4 SCTP Management Procedures
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These procedures support the SUA management of SCTP Associations and
ASP Paths between SGs and ASPs.
3.4.1 State Maintenance
The SUA layer on at each AS needs to maintain the state of each ASP
under its control, as a way to manage the state and connections of the
local ASPs. At a SG, the state of each ASP is needed as input to the
SGs address translation and mapping function.
3.4.1.1 ASP States
The state of each ASP is maintained in the SUA layer at the
controlling AS. The state of an ASP changes due to events. The events
include:
* Reception of messages from that ASP's SUA layer
* Reception of messages from a different ASP's SUA layer
* Reception of indications from the SCTP layer
* Switch over timer triggers
The ASP state transition diagram is shown in Figure 4. The possible
states of an ASP are:
ASP-DOWN: The Application Server Process is unavailable. Initially
all ASPs will be in this state.
ASP-UP: The Application Server Process is available but application
traffic is stopped.
ASP-ACTIVE: The Application Server Process is available and
application traffic is active.
+-------------+
|-------->| |
| | ASP-ACTIVE |
| | |
| | |
| +-------------+
| ^ |
| ASP | | ASP
| Active | | Inactive
| | v
| +-------------+
| | |
ASP Down / | | |
SCTP CDI | | ASP-UP |
| | |
| | |
| +-------------+
| ^ |
| ASP | | ASP Down /
| Up | | SCTP CDI
| | v
| +-------------+
| | |
|-------->| |
| ASP-DOWN |
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| |
| |
+-------------+
Figure 4: ASP State Transition Diagram
SCTP CDI: The local SCTP layer's Communication Down Indication to the
Upper Layer Protocol. The local SCTP will send this indication when it
detects the loss of connectivity to the ASP's SCTP layer.
Ts: Switch over Timer Triggers
3.4.1.2 AS States
The state of the AS is maintained in the SUA layer.
The state of an AS changes due to events. These events include:
* ASP state transitions
* Recovery timer triggers
The possible states of an AS are:
AS-DOWN: The Application Server is unavailable. This state implies
that all related ASPs are in the ASP-DOWN state for this AS. Initially
the AS will be in this state.
AS-UP: The Application Server is available but no application traffic
is active (i.e., one or more related ASPs are in the ASP-UP state, but
none in the ASP-Active state).
AS-ACTIVE: The Application Server is available and application traffic
is active. This state implies that one ASP is in the ASP-ACTIVE
state.
AS-PENDING: An active ASP has transitioned from active to inactive or
down and it was the last remaining active ASP in the AS. A recovery
timer T(r) will be started and all incoming SCN messages will be
queued by the SG. If an ASP becomes active before T(r) expires, the AS
will move to AS-ACTIVE state and all the queued messages will be sent
to the active ASP.
If T(r) expires before an ASP becomes active, the SG stops queuing
messages and discards all previously queued messages. The AS will
move to AS-UP if at least one ASP is in ASP-UP state, otherwise it
will move to AS-DOWN state.
+----------+ one ASP trans ACTIVE +-------------+
| |------------------------>| |
| AS-UP | | AS-ACTIVE |
| | | |
| |< -| |
+----------+ \ / +-------------+
^ | \ Tr Trigger / ^ |
| | \ at least one / | |
| | \ ASP in UP / | |
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
| | \ / | |
| | \ / | |
| | \ /---/ | |
one ASP | | \ / one ASP | | ACTIVE ASP
trans | | all ASP \-/----\ trans | | trans to UP or
to UP | | trans to / \ ACTIVE | | ACTIVE ASP
| | DOWN / \ | | SCTP CDI
| | / \ | |
| | / \ | |
| | /all ASP \ | |
| v / trans to \ | v
+----------+ / DOWN \ +-------------+
| |<--/ -| |
| AS-DOWN | | AS-PENDING |
| | | (queuing) |
| |<------------------------| |
+----------+ Tr Trigger no ASP +-------------+
in UP state or
prev ACTIVE ASP trans
to DOWN state
Tr = Recovery Timer
Figure 5: AS State Transition Diagram
3.4.2 ASPM procedures for primitives
Before the establishment of an SCTP association the ASP state at both
the AS and ASP is assumed to be "Down".
When the SUA layer receives an M-SCTP ESTABLISH request primitive from
the Layer Management, the SUA layer will try to establish an SCTP
association with the remote SUA peer. Upon reception of an eventual
SCTP-Communication Up confirm primitive from the SCTP, the SUA layer
will invoke the primitive M-SCTP ESTABLISH confirm to the Layer
Management.
Alternatively, if the remote SUA-peer establishes the SCTP association
first, the SUA layer will receive an SCTP Communication Up indication
primitive from the SCTP. The SUA layer will then invoke the primitive
M-SCTP ESTABLISH indication to the Layer Management.
Once the SCTP association is established, The SUA layer at an ASP will
then find out the state of its local SUA-user from the Layer
Management using the primitive M-ASP STATUS. Based on the status of
the local SUA-User, the local ASP SUA Application Server Process
Maintenance (ASPM) function will initiate the ASPM procedures, using
the ASP-Up/-Down/-Active/-Inactive messages to convey the ASP-state to
the SG - see Section 3.3.3.
If the SUA layer subsequently receives an SCTP-Communication Down
indication from the underlying SCTP layer, it will inform the Layer
Management by invoking the M-SCTP STATUS indication primitive. The
state of the ASP will be moved to "Down."
At an ASP, the Layer Management may try to reestablish the SCTP
association using M-SCTP ESTABLISH request primitive.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
3.4.3 ASPM procedures for peer-to-peer messages
3.4.3.1 ASP-Up
The AS will mark the path as up if an explicit ASP UP (ASPUP) message
is received and internally the path is allowed to come up (i.e., not
in a locked local maintenance state). An ASP UP (ASPUP) message will
be sent to acknowledge the received ASPUP. The SG will respond to a
ASPUP with a ASPDN message if the path is in a locked maintenance
state.
The receiving ASP will send a ASPUP message in response to a received
ASPUP message from the ASP even if that path was already marked as UP.
The paths are controlled by the ASP.
The ASP will send ASPUP messages every t(a) seconds until the path
comes up (i.e. until it receives a ASPUP message from the remote peer
for that path). The ASP may decide to reduce the frequency (say to
every 5 seconds) if the an acknowledgement is not received after a few
tries.
The ASP should wait for the ASPUP message from the remote peer before
transmitting ASP maintenance messages (ASPIA or ASPAC) or SUA messages
or it will risk message loss.
3.4.3.2 ASP Down
The AS will mark the ASP as down and send a ASPDN message to the ASP
if one of the following events occur:
- an ASP Down(ASPDN) message is received from the ASP,
- the ASP is locked by local maintenance.
The AS will also send a ASPDN message when the ASP is already down and
a ASPDN) message is received from the ASP.
The ASP will send ASPDN whenever it wants to take down a ASP. Since
it is possible for ASPDN messages and responses can be lost (for
example, during a node failover), the ASP can send ASPDN messages
every t(a) seconds until the path comes down (i.e. until it receives a
ASPDN message from the remote peer for that path).
3.4.3.3 ASP Version Control
If a ASP Up message with an unknown version is received, the receiving
end will respond with an Error message. This will indicate to the
sender which version the receiving node supports.
This is useful when protocol version upgrades are being performed. A
node with the newer version should support the older versions used on
other nodes it is communicating with.
The version field in the Error message header associated will indicate
the version supported by the node.
3.4.3.4 ASP Active
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
When an ASP Active (ASPAC) message is received, the ASP will start
traffic routing to that ASP. Reception of a ASPAC message overrides
any previous ASPAC messages and results in the ASP associated with the
ASPAC message to become the newly active ASP.
3.4.3.5 ASP Inactive
When a ASPIA message is received, message transmission to that ASP
ceases. The ASP will either discard all incoming messages or start
buffering the incoming messages for T(r)seconds after which messages
will be discarded.
If the ASP is down, all of the Paths that were supported by that ASP
are, by default, down.
4 Examples of SUA Procedures
4.1 Establishment of Association
4.1.1 SG Architecture
SG ASP1 ASP2
(Primary) (Backup)
| | |
<----ASP Up--------+ |
+----ASP Up (Ack)--> |
| | |
<-----------------------ASP Up---------+
+-----------------------ASP Up (Ack)--->
| | |
<----ASP Active----+ |
+-ASP Active Ack---> |
| | |
4.1.2 IP to IP Architecture
ASP1 (AS1) ASP1 (AS2) ASP2 (AS2)
(Primary) (Backup)
| | |
<----ASP Up--------+ |
+----ASP Up (Ack)--> |
| | |
<-----------------------ASP Up---------+
+-----------------------ASP Up (Ack)--->
| | |
<----ASP Active----+ |
+-ASP Active Ack---> |
| | |
4.2 ASP fail-over Procedures
SG ASP1 ASP2
| | |
|<-----ASP Inactive-------| |
|---NTFY(ASP Inactive)--->| |
|--------------------NTFY(ASP-Inactive) (Optional)-->|
| | |
|<------------------------------ ASP Active----------|
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
|-----------------------------NTFY(ASP-Active)------>|
| |
4.3 SUA/SCCP-User Boundary Examples
4.3.1 Data Transfer
This is an example of data transfer, assuming associations are already
established.
SEP SG SG ASP ASP
SCCP SUA SCTP SCTP SUA
| | | | |
+----UDT-----> | | |
| +---Send----> | |
| |.. . . . . . . CLDT . . . . . . . .>
| | +---data----> |
| | | +-data arr-->
| | | <-rec data--|
| | <---sack----+ |
| <-data arr--+ | |
| +-rec data--> | |
| < . . . . . . . CLDA . . . . . . . ..
| | | | |
5 Security
5.1 Introduction
SUA is designed to carry signaling messages for telephony services. As
such, SUA must involve the security needs of several parties: the end
users of the services; the network providers and the applications
involved. Additional security requirements may come from local
regulation. While having some overlapping security needs, any
security solution should fulfill all of the different parties' needs.
5.2 Threats
There is no quick fix, one-size-fits-all solution for security. As a
transport protocol, SUA has the following security objectives:
* Availability of reliable and timely user data transport.
* Integrity of user data transport.
* Confidentiality of user data.
SUA runs on top of SCTP. SCTP provides certain transport related
security features, such as:
* Blind Denial of Service Attacks
* Flooding
* Masquerade
* Improper Monopolization of Services
When SUA is running in professionally managed corporate or service
provider network, it is reasonable to expect that this network
includes an appropriate security policy framework. The "Site Security
Handbook" [2196] should be consulted for guidance.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
When the network in which SUA runs in involves more than one party, it
may not be reasonable to expect that all parties have implemented
security in a sufficient manner. In such a case, it is recommended
that IPSEC is used to ensure confidentiality of user payload. Consult
[2409] for more information on configuring IPSEC services.
5.3 Protecting Confidentiality
Particularly for mobile users, the requirement for confidentiality may
include the masking of IP addresses and ports. In this case
application level encryption is not sufficient; IPSEC ESP should be
used instead. Regardless of which level performs the encryption, the
IPSEC ISAKMP service should be used for key management.
6 IANA Considerations
6.1 SCTP Protocol ID
A request will be made to IANA to assign protocol IDs. A protocol ID
for the SUA will be registered.
The protocol ID is included in each SCTP data chunk, to indicate which
protocol SCTP is carrying. This protocol ID is not directly used by
SCTP but may be used by certain network entities to identify the type
of information being carried in this DATA chunk.
6.2 Port Number
A request will be made to IANA to assign an SUA Port Number. This
Port Number is the port which the SG listen to when receiving SCTP
datagrams.
7 Timer Values
Ta 2 seconds
Tr 2 seconds
8 Acknowledgements
The authors would like to thank Lode Coene, Marja-Liisa Hamalainen and
Markus Maanoja for their insightful comments and suggestions.
Funding for the RFC editor function is currently provided by the
Internet Society.
9 Authors' Addresses
John Loughney
Nokia Research Center
PO Box 407
FIN-00045 Nokia Group
Finland
[email protected]
Greg Sidebottom
Nortel Networks
3685 Richmond Rd,
Nepean, Ontario, Canada K2H 5B7
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
[email protected]
Guy Mousseau
Nortel Networks
3685 Richmond Rd
Nepean, Ontario, Canada K2H 5B7
Stephen Lorusso
Unisphere Solutions
One Executive Drive
Chelmsford, MA 01824
USA
email: [email protected]
10 References
[2719] RFC 2719, "Framework Architecture for Signaling
Transport"
[ITU SCCP] ITU-T Recommendations Q.711-714, 'Signaling System No.
7 (SS7) - Signaling Connection Control Part (SCCP)'
[ANSI SCCP] ANSI T1.112 'Signaling System Number 7 - Signaling
Connection Control Part'
[ITU TCAP] ITU-T Recommendation Q.771-775 'Signaling System No. 7
SS7) - Transaction Capabilities (TCAP)
[ANSI TCAP] ANSI T1.114 'Signaling System Number 7 - Transaction
Capabilities Application Part'
[RANAP] 3G TS 25.413 V3.0.0 (2000-01) 'Technical Specification
3rd Generation Partnership Project; Technical
Specification Group Radio Access Network; UTRAN Iu
Interface RANAP Signalling'
[SCTP] Stream Control Transport Protocol <draft-ietf-sigtran-
sctp-010.txt>, June 2000, Work in Progress.
[M3UA] MTP3-User Adaptation Layer <draft-ietf-sigtran-m3ua-
02.txt>, March 2000, Work in Progress.
[2401] RFC 2401, "Security Architecture for the Internet
Protocol", S. Kent, R. Atkinson, November 1998.
[UTRAN IUR] 3G TS 25.420 V3.0.0 (2000-01) "Technical Specification
3rd Generation Partnership Project; Technical
Specification Group Radio Access Network; UTRAN Iur
Interface General Aspects and Principles"
[2196] RFC 2196, "Site Security Handbook", B. Fraser Ed.,
September 1997.
[ENUM] "ENUM Requirements" <draft-ietf-enum-rqmts-01.txt>,
December 1999, Work in Progress.
[E.164-DNS] "ENUM Service Specific Provisioning: Principles of
Operation" , <draft-ietf-enum-e164dir-01.txt>, April
2000, Work in Progress.
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Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
Appendix A: Message mapping between SCCP and SUA.
This is for illustrative purposes only.
SUA SCCP SCCP Classes Mgt. SUA
Name Name Full Name 0 1 2 3 Msg. Usage
======================================================================
Connectionless Messages
CLDT UDT Unitdata X X - - - -
CLDT XUDT Extended unitdata X X - - - -
CLDT LUDT Long unitdata X X - - - -
CLDA UDTS Unitdata service X X - - - -
CLDA XUDTS Extended unitdata serv. X X - - - -
CLDA LUDTS Long unitdata service X X - - - -
Connection-Oriented Messages
CODT DT1 Data form 1 - - X - - -
CODT DT2 Data form 2 - - - X - -
CODT ED Expedited data - - - X - -
CODA AK Data acknowledgement - - - X - -
CODA EA Expedited data ack. - - - X - -
CORE CR Connection request - - X X - -
COAK CC Connection confirm - - X X - -
COAK CREF Connection refused - - X X - -
RELRE RLSD Released - - X X - -
RELCO RLC Release complete - - X X - -
RESRE RSR Reset request - - - X - -
RESCO RSC Reset confirm - - - X - -
General Protocol Messages
ERR ERR Protocol data unit error - - X X - X
AUD IT Inactivity test - - X X - X
VEN n/a n/a - - - - - X
SS7 MGT Messages
DUNA SSP subsystem-prohibited - - - - X -
DAVA SSA subsystem-allowed - - - - X -
DAUD SST subsystem-status-test - - - - X -
SCON SSC SCCP/subsystem-congested - - - - X -
SOR subsystem-oos-req - - - - X -
SOG subsystem-oos-grant - - - - X -
SUA MGT Messages
ASPUP n/a n/a - - - - - X
ASPDN n/a n/a - - - - - X
ASPAC n/a n/a - - - - - X
ASPIA n/a n/a - - - - - X
NTFY n/a n/a - - - - - X
- = Message not applicable for this protocol class.
X = Message applicable for this protocol class.
n/a = not applicable
Copyright Statement
Copyright (C) The Internet Society (2000). All Rights Reserved.
Loughney, et al. [Page 45]
Internet Draft SS7 SCCP-User Adaptation Layer July 2, 2000
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published and
distributed, in whole or in part, without restriction of any kind,
provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
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The limited permissions granted above are perpetual and will not be
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This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
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WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Loughney, et al. [Page 46]
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