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Network Working Group Brian Bidulock
INTERNET-DRAFT OpenSS7 Corporation
Expires in six months January 2, 2003
Application Server Process (ASP) Extension (ASPEXT) Framework
for
Signalling User Adaptation Layers
<draft-bidulock-sigtran-aspext-01.txt>
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 or 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
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Abstract
This Internet-Draft describes ASP Extensions (ASPEXT) for
Signalling User Adaptation Protocols [IUA...TUA], which permits
cooperating Signalling Peer Processes (SPPs) to indicate to each other
the specific protocol extensions that each supports.
1. Introduction
1.1. Scope
This Internet-Draft provides parameters and procedures in extension
to the parameters and procedures of the Signalling User Adaptation
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Layers (UAs) [IUA...TUA], for the purpose of supporting a framework
for extending the parameters and procedures of these Adaptation
Layers.
UA implementations with ASPEXT are intended to be compatible with
UA implementations not supporting this configuration.
1.2. Change History
Changes from Version 0.0 to Version 1.0:
- added this history section,
- updated references,
- updated version numbers and dates,
- updated postscript diagrams,
- updated author's address.
1.3. Terminology
ASPEXT adds the following terms to the terminology presented in the
UA documents:
ASP Extension (ASPEXT) - An extension to one or more of the the UAs
that requires identification of the capabilities of the SPP to
support the extension as part of its requirements.
Signalling Peer Process (SPP) - refers to an ASP, SGP or IPSP.
Signalling User Adaptation Layer (UA) - one or more of the Stream
Control Transmission Protocol (SCTP) [RFC 2960] ISDN Signalling
User Adaptation Layers [IUA...GR303UA] or SS7 Signalling User
Adaptation Layers [M2UA...TUA]. supporting the concept of ASP
Management[1].
1.4. Overview
There is a need to provide extensions for the Signalling User
Adaptation Layer protocols that require interworking between
Signalling Peer Processes (SPPs) implementing a specific extension and
SPPs not implementing the extension.
ASPEXT provides parameters and procedures that allow Signalling
Peer Processes (SPPs) implementing a given set of extensions to
indicate its support to other SPPs as well as to discover the support
for extensions provided by peer SPPs.
1.4.1. Existing Extension Management
The existing UA procedures[2] make no provisions for the management
of extensions. Any mechanism that an SPP might use to determine the
extension support of peer SPPs depends upon implementation dependent
configuration information or protocols between SPPs.
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For example, if an ASP implements and extension that requires that
the ASP have knowledge of whether a peer SGP supports the extension,
the ASP would have to be configured with this SGP-specific
information, or would need to use some implementation-dependent
mechanism to determine this information.
The lack of an IETF procedure for managing extension support
represents a deficiency of the existing UA procedures[2] that detracts
from interoperability between separate implementations of SPP peers.
1.4.2. ASP Extension Management
ASPEXT provide support for the following:
- Support for an SPP indicating to peer SPPs the extensions that are
supported.
- Support for an SPP discovering what extensions are supported by
peer SPPs.
- Support for an SPP supporting ASPEXT interworking with an SPP that
does not support ASPEXT.
2. Conventions
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL, when they
appear in this document, are to be interpreted as described in [RFC
2119].
3. Protocol Elements
ASPEXT provides the following parameters and the messages in which
they are included in addition to the parameters of the UAs.[3]
3.1. Parameters
ASPEXT provides the following parameters in addition to the
parameters defined for the UAs.[3]
3.1.1. ASP Extensions
The ASP Extensions parameter is a common parameter used in the
ASPUP and ASPUP ACK messages to identify the extension capabilities of
the ASP (ASPUP) and the extension capabilities of the SGP or IPSP
(ASPUP ACK).
The ASP Extensions parameter is formatted as follows:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0xXXXX | Length = 8 |
+- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
| ASP Extension #1 |
+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
| ASP Extension #2 |
+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
\ . \
/ . /
\ . \
/ /
+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
| ASP Extension #n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
EDITOR'S NOTE:- The parameter tag values shown as 0xXXXX
above will be assigned by IANA within the common parameter
range of the SIGTRAN UAs and may change its value in further
versions of this document.
The ASP Extensions parameter contains one or more of the following
fields:
ASP Extension field: 32-bits (unsigned integer)
The ASP Extension field contains an IANA registered extension
identifier number that identifies the extension supported by the ASP
in an ASPUP or an extension supported by the SGP or IPSP in an ASPUP
ACK. Examples of valid values for the ASP Extension field are as
follows:
0 None
1 Protocol Limits Extension [SGINFO]
2 Load Selection Extension [LOADSEL]
3 Load Grouping Extension [LOADGRP]
4 Correlation Id and Heartbeat Extension [CORID]
5 Registration Extension [REGEXT]
6 Session Identification Extension [SESSID]
- (All other values are IETF reserved.)
Each occurrence of an ASP Extension field indicates that the sending
SPP supports the specified extension. The ASP Extension parameter
MUST contain at least one ASP Extension value. An ASP Extension
field containing the value "None" MUST be the only ASP Extension
field included in the ASP Extension parameter.
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3.2. Messages
ASPEXT extends the following messages defined for the UAs.[3]
3.2.1. ASP Up (ASPUP)
ASPEXT supplements the ASPUP message by permitting the following
optional parameters to be included in the message:
Extension Parameters
-----------------------------------------
ASP Extensions Optional
The format of the resulting ASPUP message 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0x0011 | Length = 8 |
+- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
| ASP Identifier |
+-------------------------------+-------------------------------+
| Tag = 0xXXXX | Length = 8 |
+- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
\ \
/ ASP Extensions /
\ \
+-------------------------------+-------------------------------+
| Tag = 0x0004 | Length |
+- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
\ \
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
EDITOR'S NOTE:- The parameter tag values shown as 0xXXXX
above will be assigned by IANA within the common parameter
range of the SIGTRAN UAs and may change its value in further
versions of this document.
To indicate its support for a specific extension, the ASP MUST
include the specific extension number in the ASP Extensions parameter
in the ASPUP message.
No other changes to the ASPUP message format are provided by this
extension.
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3.2.2. ASP Up Acknowledgment (ASPUP ACK)
ASPEXT supplements the ASPUP ACK message by permitting the
following optional parameters to be included in the message:
Extension Parameters
-----------------------------------------
ASP Extensions Optional
The format of the resulting ASPUP ACK message 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tag = 0xXXXX | Length = 8 |
+- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
\ \
/ ASP Extensions /
\ \
+-------------------------------+-------------------------------+
| Tag = 0x0004 | Length |
+- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
\ \
/ Info String /
\ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
EDITOR'S NOTE:- The parameter tag values shown as 0xXXXX
above will be assigned by IANA within the common parameter
range of the SIGTRAN UAs and may change its value in further
versions of this document.
To indicate its support for a specific extension, SGP and IPSP MUST
include the specific extension number in the ASP Extensions parameter
in the ASPUP ACK message.
No other changes to the ASPUP ACK message format are provided by
this extension.
4. Procedures
The following procedures are provided in extension to the UA
procedures by ASPEXT.
4.1. ASP Management Procedures
4.1.1. ASP Up Procedures
In extension of the "ASP Up Procedures" of the UAs[2], ASPEXT
provides the following procedures:
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Whenever an ASP, as part of the normal UA procedures, sends an ASP
Up (ASPUP) message to an SGP or IPSP it MAY include the ASP Extensions
parameter indicating the extensions supported by the ASP.
Upon receiving an ASP Up (ASPUP) message from an ASP that contains
the ASP Extensions parameter, an SGP or IPSP supporting ASPEXT MUST
register the ASP's support of the specified extensions and MUST place
an ASP Extensions parameter of its own in the responding ASP Up
Acknowledgment (ASPUP ACK) indicating which of the extensions provided
in the ASPUP are supported.
If an SGP or IPSP supporting ASPEXT receives an ASPUP message that
does not contain an ASP Extensions parameter, the SGP or IPSP MAY
assume that the ASP does not support any extensions, or MAY rely on
internal configuration data to determine the extensions supported by
the ASP. The SGP or IPSP SHOULD NOT include the ASP Extensions
parameter in the responding ASPUP ACK message.
Upon receiving an ASP Up Acknowledgment (ASPUP ACK) containing an
ASP Extensions parameter, an ASP supporting ASPEXT MUST register the
SGP or IPSP's support of the specified extensions.
If an SPP supporting ASPEXT receives an ERR message indicating the
ASP Extensions parameter as an "Invalid Parameter" in response to an
ASPUP or ASPUP ACK message, the SPP SHOULD re-attempt sending the
ASPUP or ASPUP ACK message without the ASP Extensions parameter.
4.1.2. ASP Down Procedures
In extension to the "ASP Down Procedure" of the UAs[2], ASPEXT
provides the following procedures:
Whenever an ASP, as part of the normal UA procedures, sends an ASP
Down (ASPDN) message to an SGP or IPSP, the ASP supporting ASPEXT
SHOULD clear any ASP Extensions previously registered while the ASP
was in the ASP-UP state for the SGP.
Upon sending an ASP Down Acknowledgment (ASPDN ACK), either in
response to an ASPDN or unsolicited, an SGP supporting ASPEXT SHOULD
clear any ASP Extensions previously registered while the ASP was in
the ASP-UP state at the SGP.
5. Examples
5.1. Both ASP and SGP/IPSP support ASP Extensions
Figure 1 illustrates an example where both the ASP and the SGP or
IPSP support ASPEXT.
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ASP SGP/IPSP
| |
(1) | SCTP Association Established |
|<- - - - - - - - - - - - - - - - - - - ->|
| |
(2) | ASPUP (Extensions: LOADSEL, CORID) |
|---------------------------------------->|
| |
(3) | ASPUP ACK (Extensions: LOADSEL) |
|<--------------------------------------->|
| |
(4) | |
| |
Figure 1. Both ASP and SGP/IPSP support ASP Extensions
The example sequence of events for the example illustrated in
Figure 1 is as follows:
(1) An SCTP Association is established or the ASP is otherwise in
the ASP-DOWN state.
(2) The ASP sends an ASPUP message to the SGP or IPSP containing an
ASP Extensions parameter identifying (for example) two
extensions: Load Selection [LOADSEL] and Correlation
Id/Heartbeat [CORID]; indicating the ASP's support for these
two extensions requiring interworking support.
(3) The SGP or IPSP responds with an ASPUP ACK message containing
an ASP Extensions parameter identifying (for example) support
for only one extension: Load Selection [LOADSEL]
(4) The ASP and SGP/IPSP register the peer's support (or lack of
support) for the LOADSEL and CORID extensions and modify
subsequent procedures accordingly.
5.2. Interworking Examples
5.2.1. ASP supports ASP Extensions, SGP/IPSP does not
Figure 2 and 3 illustrate an example where the ASP supports ASPEXT
but the SGP or IPSP does not.
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ASP SGP/IPSP
| |
(1) | SCTP Association Established |
|<- - - - - - - - - - - - - - - - - - - ->|
| |
(2) | ASPUP (Extensions: LOADSEL, CORID) |
|---------------------------------------->|
| |
(3) | ASPUP ACK |
|<--------------------------------------->|
| |
(4) | |
| |
Figure 2. ASP supports ASP Extensions, SGP/IPSP ignores
The example sequence of events for the example illustrated in
Figure 2 is as follows:
(1) An SCTP Association is established or the ASP is otherwise in
the ASP-DOWN state.
(2) The ASP sends an ASPUP message to the SGP or IPSP containing an
ASP Extensions parameter identifying (for example) two
extensions: Load Selection [LOADSEL] and Correlation
Id/Heartbeat [CORID]; indicating the ASP's support for these
two extensions requiring interworking support.
(3) The SGP or IPSP ignores the ASP Extensions parameter in the
ASPUP and responds with an ASPUP ACK message containing no ASP
Extensions parameter.
(4) The ASP either assumes that the SGP or IPSP does not support
the LOADSEL or CORID extensions, or relies upon configuration
data to indicate the SGP or IPSP's support for these
extensions. The ASP modifies its subsequent procedures with
regard to the extension accordingly.
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ASP SGP/IPSP
| |
(1) | SCTP Association Established |
|<- - - - - - - - - - - - - - - - - - - ->|
| |
(2) | ASPUP (Extensions: LOADSEL, CORID) |
|---------------------------------------->|
| |
(3) | ERR("Invalid Parameter") |
|<--------------------------------------->|
| |
(4) | ASPUP |
|---------------------------------------->|
| |
(5) | ASPUP ACK |
|<--------------------------------------->|
| |
(6) | |
| |
Figure 3. ASP supports ASP Extensions, SGP/IPSP refuses
The example sequence of events for the example illustrated in
Figure 3 is as follows:
(1) An SCTP Association is established or the ASP is otherwise in
the ASP-DOWN state.
(2) The ASP sends an ASPUP message to the SGP or IPSP containing an
ASP Extensions parameter identifying (for example) two
extensions: Load Selection [LOADSEL] and Correlation
Id/Heartbeat [CORID]; indicating the ASP's support for these
two extensions requiring interworking support.
(3) The SGP or IPSP refuses to accept the ASP Extensions parameter
in the ASPUP message and responds with an ERR("Invalid
Parameter") message indicating such.
(4) The ASP re-attempts by sending an ASPUP message without an ASP
Extensions parameter.
(5) The SGP or IPSP responds with an ASPUP ACK message containing
no ASP Extensions parameter.
(6) The ASP either assumes that the SGP or IPSP does not support
the LOADSEL or CORID extensions, or relies upon configuration
data to indicate the SGP or IPSP's support for these
extensions. The ASP modifies its subsequent procedures with
regard to the extension accordingly.
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5.2.2. SGP/IPSP supports ASP Extensions, ASP does not
Figure 4 illustrates an example where the SGP or IPSP supports
ASPEXT but the ASP does not.
ASP SGP/IPSP
| |
(1) | SCTP Association Established |
|<- - - - - - - - - - - - - - - - - - - ->|
| |
(2) | ASPUP |
|---------------------------------------->|
| |
(3) | ASPUP ACK |
|<--------------------------------------->|
| |
(4) | |
| |
Figure 4. SGP/IPSP supports ASP Extensions, ASP ignores
The example sequence of events for the example illustrated in
Figure 4 is as follows:
(1) An SCTP Association is established or the ASP is otherwise in
the ASP-DOWN state.
(2) The ASP sends an ASPUP message to the SGP or IPSP not
containing an ASP Extensions parameter.
(3) The SGP or IPSP responds with an ASPUP ACK message not
containing an ASP Extensions parameter.
(4) The SGP either assumes that the ASP does not support the CORID
extensions, or relies upon configuration data to indicate the
ASP's support for these extensions. The SGP modifies its
subsequent procedures with regard to the extension accordingly.
6. Security
ASPEXT does not introduce any new security risks or considerations
that are not already inherent in the UA [IUA...TUA]. Please see the
"Security" sections of IUA [IUA], DUA [DUA], V5UA [V5UA], GR303UA
[GR303UA], M2UA [M2UA], M3UA [M3UA], SUA [SUA], ISUA [ISUA] and TUA
[TUA], for security considerations and recommendations that are
applicable to each of these UAs.
It is possible that an attacker or malicious endpoint might
manipulate the ASP Extensions parameter in an attempt to cause denial
of service attacks on either an SGP or ASP. However, because each
extension has a fall back procedure which provides for interworking
without the ASPEXT capability, ASPEXT introduces no further threat if
the endpoint adheres to the following rule:
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Although an endpoint has registered an ASP extension against a peer
endpoint, the registering endpoint SHOULD take this information as
advisory and continue to effect interworking and fullback procedures
in the event that the information in the ASP Extensions parameter is
malicious, in error, or invalid.
7. IANA Considerations
7.1. Extensions
ASPEXT provides an additional ASP Extensions message parameter to
the common parameter range of the SIGTRAN UAs [IUA...TUA]:
(a) The parameter is named the ASP Extensions parameter.
(b) The structure of the ASP Extensions parameter field conforms to
the UA general TLV format and is described in detail in Section
3.1.1.
(c) The detailed definition of each component of the ASP Extensions
parameter values is described in Section 3.1.1.
(d) This document also provides a detailed description of the
intended use of the ASP Extensions parameter, and in which
messages the ASP Extensions parameter should appear, how many
times, and when.
EDITOR'S NOTE:- The ASP Extensions parameter tag value shown
throughout this document as 0xXXXX will be assigned by IANA
within the common parameter range of the SIGTRAN UAs and may
change its value in further versions of this document.
7.2. Protocol Extensions
UA protocols may be extended through IANA in three ways:
- through definition of additional message classes;
- through definition of additional message types; and,
- through definition of additional message parameters.
The definition and used of new message classes, types and
parameters is an integral part of the SIGTRAN adaptation layers.
Thus, these extensions are assigned by IANA through an IETF Consensus
action [RFC 2434].
The proposed extension MUST in no way adversely affect the general
working of the protocol.
To permit interoperability of implementations supporting a
particular extension with implementation not supporting that
extension, a UA Extension number can be assigned to a protocol
B. Bidulock Version 0.1 Page 12
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extension in accordance with this document. A new registry will be
created by IANA to allow:
7.2.1. IETF Defined UA Protocol Extension
In additional to the documentation required for each message class,
message type and message parameter extension, the documentation of the
UA Protocol Extension number MUST include the following information:
(a) A long and short name for the Extension.
(b) A detailed description of the the purpose of the Extension.
(c) A detailed description of the Message Classes, Types and
Parameters provided by the extension.
(d) A detailed description of the interworking between UA
implementations supporting the Extension and UA implementations
not supporting the Extension.
Notes
[1] Currently all SS7 Signalling User Adaptation Layers support ASP
Management with the exception of M2PA [M2PA06].
[2] See, for example, Section 4 of the specific UA document
[M3UA...TUA].
[3] See, for example, Section 3 of the specific UA document
[M3UA...TUA].
References
IUA.
K. Morneault, S. Rengasami, M. Kalla and G. Sidebottom, "ISDN
Q.921-User Adaptation Layer," RFC 3057, The Internet Society
(November, 2000). [Normative]
DUA.
R. Mukundan, N. Mangalpally, K. Morneault and A. Vydyam,
"DPNSS/DASS 2 Extensions to the IUA Protocol," <draft-ietf-
sigtran-dua-04.txt>, Internet Engineering Task Force - Signalling
Transport Working Group (October 2002). Work In Progress.
[Informative]
V5UA.
E. Weilandt, N. Khanchandani and S. Rao, "V5.2-User Adaption
Layer (V5UA)," <draft-ietf-sigtran-v5ua-03.txt>, Internet
Engineering Task Force - Signalling Transport Working Group (June
2002). Work In Progress. [Informative]
B. Bidulock Version 0.1 Page 13
Internet Draft UA ASPEXT January 2, 2003
GR303UA.
R. Mukundan, K. Morneault, "GR-303 extensions to the IUA
Protocol," <draft-ranjith-sigtran-gr303ua-00.txt>, Internet
Engineering Task Force - Signalling Transport Working Group
(October 2002). Work In Progress. [Informative]
M2UA.
K. Morneault, R. Dantu, G. Sidebottom, B. Bidulock and J. Heitz,
"Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) - User
Adaptation Layer," RFC 3331, Internet Engineering Task Force -
Signalling Transport Working Group (September, 2002).
[Normative]
M3UA.
G. Sidebottom, K. Morneault and J. Pastor-Balbas, (eds),
"Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User
Adaptation Layer (M3UA)," RFC 3332, Internet Engineering Task
Force - Signalling Transport Working Group (September, 2002).
[Normative]
SUA.
J. Loughney, G. Sidebottom, L. Coene, G. Verwimp, J. Keller and
B. Bidulock, "SS7 SCCP-User Adaptation Layer (SUA)," <draft-ietf-
sigtran-sua-14.txt>, Internet Engineering Task Force - Signalling
Transport Working Group (June 30, 2002). Work in Progress.
[Normative]
ISUA.
B. Bidulock, "SS7 ISUP-User Adaptation Layer (ISUA)," <draft-
bidulock-sigtran-isua-00.txt>, Internet Engineering Task Force -
Signalling Transport Working Group (January 5, 2003). Work In
Progress. [Informative]
TUA.
B. Bidulock, "SS7 TCAP-User Adaptation Layer (TUA)," <draft-
bidulock-sigtran-tua-01.txt>, Internet Engineering Task Force -
Signalling Transport Working Group (January 2, 2003). Work In
Progress. [Informative]
RFC 2960.
R. Stewart, Q. Xie, K. Morneault, C. Sharp, H. J. Schwarzbauer,
T. Taylor, I. Rytina, H. Kalla, L. Zhang and V. Paxson, "Stream
Control Transmission Protocol (SCTP)," RFC 2960, The Internet
Society (February 2000). [Normative]
M2PA06.
T. George, R. Dantu, M. Kalla, H. J. Schwarzbauer, G. Sidebottom,
K. Morneault and B. Bidulock, "SS7 MTP2-User Peer-to-Peer
Adaptation Layer," <draft-ietf-sigtran-m2pa-06.txt>, Internet
Engineering Task Force - Signalling Transport Working Group
(August 28, 2002). Work In Progress. [Informative]
RFC 2119.
S. Bradner, "Key words for use in RFCs to Indicate Requirement
B. Bidulock Version 0.1 Page 14
Internet Draft UA ASPEXT January 2, 2003
Levels," RFC 2119 - BCP 14, Internet Engineering Task Force
(March 1997). [Normative]
SGINFO.
B. Bidulock, "Signalling Gateway (SG) Information Support,"
<draft-bidulock-sigtran-sginfo-01.txt>, Internet Engineering Task
Force - Signalling Transport Working Group (January 2, 2003).
Work In Progress. [Informative]
LOADSEL.
B. Bidulock, "Load Selection Extension for Signalling User
Adaptation Layers (LOADSEL)," <draft-bidulock-sigtran-
loadsel-01.txt>, Internet Engineering Task Force - Signalling
Transport Working Group (January 2, 2003). Work In Progress.
[Informative]
LOADGRP.
B. Bidulock, "Load Grouping Extension for Signalling User
Adaptation Layers (LOADGRP)," <draft-bidulock-sigtran-
loadgrp-01.txt>, Internet Engineering Task Force - Signalling
Transport Working Group (January 2, 2003). Work In Progress.
[Informative]
CORID.
B. Bidulock, "Correlation Id and Heartbeat Procedures Supporting
Lossless Fail-Over," <draft-bidulock-sigtran-corid-01.txt>,
Internet Engineering Task Force - Signalling Transport Working
Group (January 2, 2003). Work In Progress. [Informative]
REGEXT.
B. Bidulock, "Registration Extensions for SS7 Signalling User
Adaptation Layers," <draft-bidulock-sigtran-regext-01.txt>,
Internet Engineering Task Force - Signalling Transport Working
Group (January 2, 2003). Work In Progress. [Informative]
SESSID.
B. Bidulock, "Session Identification for SS7 Signalling User
Adaptation Layers," <draft-bidulock-sigtran-sessid-01.txt>,
Internet Engineering Task Force - Signalling Transport Working
Group (January 2, 2003). Work In Progress. [Informative]
RFC 2434.
T. Narten, H. T. Alvestrand, "Guidelines for Writing an IANA
Considerations Section in RFCs," RFC 2434, The Internet Society
(October, 1998). [Normative]
B. Bidulock Version 0.1 Page 15
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Author's Addresses
Brian Bidulock Phone: +1-780-490-1141
OpenSS7 Corporation Email: [email protected]
1469 Jeffreys Crescent URL: http//www.openss7.org/
Edmonton, AB T6L 6T1
Canada
This Internet draft expires July, 2003.
B. Bidulock Version 0.1 Page 16
Internet Draft UA ASPEXT January 2, 2003
List of Illustrations
Figure 1 - Both ASP and SGP/IPSP support ASP Extensions ....... 8
Figure 2 - ASP supports ASP Extensions, SGP/IPSP ignores ...... 9
Figure 3 - ASP supports ASP Extensions, SGP/IPSP refuses ...... 10
Figure 4 - SGP/IPSP supports ASP Extensions, ASP ignores ...... 11
Table of Contents
Status of this Memo ........................................... 1
Abstract ...................................................... 1
1 Introduction ................................................ 1
1.1 Scope ..................................................... 1
1.2 Change History ............................................ 2
1.3 Terminology ............................................... 2
1.4 Overview .................................................. 2
1.4.1 Existing Extension Management ........................... 2
1.4.2 ASP Extension Management ................................ 3
2 Conventions ................................................. 3
3 Protocol Elements ........................................... 3
3.1 Parameters ................................................ 3
3.1.1 ASP Extensions .......................................... 3
3.2 Messages .................................................. 5
3.2.1 ASP Up (ASPUP) .......................................... 5
3.2.2 ASP Up Acknowledgment (ASPUP ACK) ....................... 6
4 Procedures .................................................. 6
4.1 ASP Management Procedures ................................. 6
4.1.1 ASP Up Procedures ....................................... 6
4.1.2 ASP Down Procedures ..................................... 7
5 Examples .................................................... 7
5.1 Both ASP and SGP/IPSP support ASP Extensions .............. 7
5.2 Interworking Examples ..................................... 8
5.2.1 ASP supports ASP Extensions, SGP/IPSP does not .......... 8
5.2.2 SGP/IPSP supports ASP Extensions, ASP does not .......... 11
6 Security .................................................... 11
7 IANA Considerations ......................................... 12
7.1 Extensions ................................................ 12
7.2 Protocol Extensions ....................................... 12
7.2.1 IETF Defined UA Protocol Extension ...................... 13
Notes ......................................................... 13
References .................................................... 13
Author's Addresses ............................................ 16
List of Illustrations ......................................... 17
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Internet Draft UA ASPEXT January 2, 2003
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