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TC32-TG17 - IP-based Multimedia Business Communications

Scope - Programme of work - TC32


TC32-TG17 was formed in mid 1999 to develop standards and technical reports for IP-based multimedia communications in a business environment.

TG17's work is concerned with Corporate Telecommunication Networks (CN) that support multi-media real-time communications based on the Internet Protocol (IP).

Since SIP has become the dominant signalling protocol for IP-based CNs, work focused on SIP-based CNs, and in particular on CNs that are able to interoperate using IP and SIP with carrier networks, in particular Next Generation Networks (NGN), and with other enterprise networks. The term "Next Generation Corporate Networks" (NGCN) is used for such CNs.

This work includes:

• Interconnection of Next Generation Corporate Networks (NGCN) with Next Generation carrier Networks (NGN) using SIP-based signalling;
• Mobile business communication, including mobility aspects of intra- and inter-NGCN as well as NGCN – NGN communication;
• Inter-NGCN communication by peering arrangements / federations.

The TC32-TG17 White Paper on NGCN is available here.

Completed work of TG17 includes interoperation with Private Integrated Services Networks (PISN):

• Interworking of PISNs and IP-based CNs via a gateway, i.e., interworking between QSIG and H.323 and interworking between QSIG and the Session Initiation Protocol (SIP);
• Connection of PISN components via IP network infrastructure, i.e., tunnelling of QSIG over H.323 and tunnelling of QSIG over SIP.

Ecma has published the following Standards and Technical Reports prepared by TG17.

Next Generation Networks

TG17 developed a series of TRs on "Next Generation Corporate Networks" (NGCN).

TR/95 ”General” surveys IP-based enterprise communication within Corporate telecommunication Networks (CNs) and in particular NGCNs. It investigates key technical issues and identifies current standardisation work.

The entire series, which builds upon TR/91 and TR/92, focuses on inter-zone and inter-domain communication, including communication between parts of the same enterprise, between enterprises and between enterprises and carriers.

TG17 observes activities in the area of NGN (Next Generation Network), in particular the work of ETSI TISPAN. A close co-operation between TG17 and TISPAN Working Groups has been established.

Contributions to the work of the IETF

As part of its work on TR "NGCN (Next Generation Corporate Networks)", TG17 has investigated peering between enterprise networks. TG17 members have submitted an Internet Draft on enterprise peering to the IETF.

Based on the work on the various Ecma Standards concerning the interworking between QSIG and SIP, members of TG17 have submitted various Internet Drafts on the following subjects to the IETF:

- Signalling interworking between QSIG Basic Call and SIP,
- Tunnelling of QSIG over SIP,
- Signalling interworking between QSIG and SIP - Call Transfer,
- Signalling interworking between QSIG and SIP - Call Diversion.

One of them, the "Signalling interworking between QSIG Basic Call and SIP" became RFC 4497 in May 2006.

ECMA-355 Tunnelling of QSIG over SIP, 3rd Edition

Standard ECMA-355 (corresponding to ISO/IEC 22535, and ETSI TS 102 345) deals with the tunnelling of QSIG messages through SIP networks. Since the publication of the second edition of this Standard, the IETF has specified several enhancements in the field of negotiating media characteristics for the underlying SIP call. Ecma TG32-TG17 has approved this new edition coping with these enhancements and adding more flexibility for architectures beyond the original scope of Standard ECMA-355.

Associated activities

TG17 works in close cooperation with ISO/IEC JTC 1/SC 06 by giving early exposure of and seeking feedback on TG17's work, to facilitate the eventual adoption of the work as International Standards.

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