| Question 16/11 � Syntax language based mechanism for the support of PSTN/ISDN
services within IP session control protocols |
Reasons for the question
The desire to support ISDN/PSTN services within networks using IP technology has
resulted in a number of solutions being worked on in numerous forums, which
encapsulate ITU-T defined signalling protocols such as ISUP.
These attempts have been based on the use of session control protocols such as the
Session Initialization Protocol (SIP) and H.323 to convey legacy PSTN/ISDN
signalling information across IP technology networks.
Issues of concern have arisen with these attempts, including issues such as
duplication of information and difficulty in supporting national and regional
variants of the ITU-T protocols.
As ITU-T has led and continues to lead the development of the PSTN/ISDN (and other
Packet-based public) networks and services control protocols, it is widely
recognized that ITU-T SG11 is the most suitable body to address the development
of a mechanism (e.g. based on a syntax language) to meet the needs of PSTN/ISDN
service support when IP and emerging technologies are utilized.
Question
To investigate, recommend and apply a mechanism to be used to ensure continuous
support of existing PSTN/ISDN services in networks where existing, IP and
emerging technologies are utilized.
Task objectives
The major focus of this question is to develop specifications� which define the mechanism to be used and
its application to support the PSTN/ISDN services over IP and emerging
technologies. Based on the requirements from Questions 6 and 9/11, the task
objectives for the question are to:
- Develop a recommendation for a signalling mechanism for the support of PSTN/ISDN services in IP and emerging
technology networks.
Expected completion: 2004 timeframe.
- Develop recommendations applying this signalling mechanism to the relevant PSTN/ISDN services network signalling
recommendations (such as SS7 ISUP, BICC).
Expected initial deliverable: 2005 timeframe.
Subsequent deliverables, within 12 months of availability of
ISUP/BICC protocol Recommendations from Q.11 and/or 12/11.
Relationships
The development of these recommendations will require close coordination activities
with:
- External organisations, particularly IETF (Sipping WG)
- ITU-T Study Group 16 (Questions D/16, 2/16), ITU-T Study Group 17 (Working Party
3/17)
- ITU-T Study Group 11 Question 6/11 "Signalling requirements for signalling support
for service interworking of both dialup Internet access and Voice, Data and
Multimedia Communications over IP-based networks"
- ITU-T Study Group 11 Question 9/11 "Signalling requirements for the support of Bearer
Independent Call Control (BICC) applications"
- ITU-T Study Group 11 Question Q.11/11 "Protocols for the support of Bearer Independent
Call Control (BICC) applications"
- ITU-T Study Group 11 Question 12/11 "Access and network signalling for advanced
narrow-band and broadband services".
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