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H.323 Forum 2002: Focus on Convergence Activities

This presentation by Paul E. Jones highlights the major activities of ITU-T SG16, including voice coding, video coding, multimedia signaling, security, quality of service, multimedia architecture, and more.

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H.323 Forum 2002: Focus on Convergence Activities

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  1. Presents H.323 Forum 2002

  2. ITU-T SG16With Focus on H.323 Activities Presented by Paul E. Jones Rapporteur ITU-T Q2/16 Cisco Systems

  3. Multimedia Convergence • IP-based networks open the door for a revolution in communications • ITU-T SG16 is focused on the convergence of voice, video, and data communications • Convergence is considered by many to be the key to realizing new market growth H.323 Forum – November 2002 – New York, NY, USA

  4. Major Activities of SG16 • Voice coding • Video coding • Multimedia signaling • Security • Quality of Service (QoS) • Multimedia architecture • User, Terminal, and Service Mobility • Emergency Telecommunications H.323 Forum – November 2002 – New York, NY, USA

  5. ITU-T SG16 Structure WP1 Facsimile and Modems WP2 MM Platform and Interworking WP3 Media Coding WP4 MM Framework E - Media coding A - MediaCom 2004 H - Accessibility to MM Systems and Services D - Interoperability of MM Systems and Services B - MM Architecture 6 - Advanced video coding 11 - Modems F - Quality of Service and End to End Performance C - MM Applications and Services 7 - Wideband speech coding 12 - DCE-DCE protocols for the PSTN and ISDN G - Security 8 - Speech coding at 4 Kbit/s ETS – Emergency Telecommunications Services 13 - DTE-DCE Interfaces and Protocols 1 - MM Systems, Terminals and Data Conferencing 9 - Variable bit-rate speech coding 14 - Facsimile terminals 2 - MM over Packet Networks (H.323) 10 - Software tools and maintenance of speech coding standards 3 - Infrastructure and Interoperability 15 - Distributed speech recognition/distributed speaker verification 4 – Video and Data Conferencing using Internet Supported Services 5 - Mobility for MM Systems and Services H.323 Forum – November 2002 – New York, NY, USA

  6. Voice Coding • Years of experience in voice coding • Virtually all VoIP systems use ITU-T voice codecs • Popular examples: G.711, G.722, G.722.1, G.723.1, G.726, G.728, G.729 H.323 Forum – November 2002 – New York, NY, USA

  7. Video Coding • Years of experience in video coding • Most IP based video systems use ITU-T video codecs • Popular examples: H.261, H.262, H.263 • Work is underway on H.264 (formerly referred to as H.26L), which will provide quality similar to H.263 and MPEG-2, but at a much lower bit-rate H.323 Forum – November 2002 – New York, NY, USA

  8. Multimedia Signaling • Data communications • Modems • Fax • Data Conferencing • Call and Conference Control • H.320, H.243 • H.324, H.245 • H.324/M • H.323, H.225.0, H.245 • Media Gateway Control H.323 Forum – November 2002 – New York, NY, USA

  9. Modems • The ITU-T is recognized as the authority on modem communication standards, with popular standards like V.34, V.90, V.92, etc. • On October 25, 2002, ITU-T SG16 approved V.150.1 and related procedures for H.323, which defines how to carry modem signals over IP networks H.323 Forum – November 2002 – New York, NY, USA

  10. Fax • Like the area of modems, the ITU-T is recognized as the authority of fax communication standards • ITU-T Recommendation T.38 defines how to carry fax signals over IP networks and is used by H.323 systems for this purpose H.323 Forum – November 2002 – New York, NY, USA

  11. Data Conferencing • The T.120-series Recommendations address data communications, with protocols that facilitate application sharing, file transfer, chat, and a shared whiteboard • T.120 may be used as a stand-alone data application protocol or within the context of a voice/video call • Most recent work completed in 2000 (virtual meeting room management) H.323 Forum – November 2002 – New York, NY, USA

  12. Call and Conference Control • H.320 – ISDN video conferencing standard • H.324 – Multimedia communications standard for low bit-rate connections • H.324/M (Annex C/H.324) – Facilitates the use of H.324 within error-prone environments, like mobile systems • H.323 – Packet-based multimedia communications standard H.323 Forum – November 2002 – New York, NY, USA

  13. Media Gateway Control • ITU-T H.248.1 defines the protocol for communication between a Media Gateway Controller, such as an H.323 MGC, and a Media Gateway • H.248.1 was developed in cooperation with the IETF (MEGACO working group) • The second version of the protocol was approved in February 2002 • Numerous packages, which enhance the base protocol with new functionality, have been defined and more are in development H.323 Forum – November 2002 – New York, NY, USA

  14. Media Gateway Controller (“Softswitch”) H.323 H.248 Media Gateway Media Gateway Media Gateway Media Gateway Media Gateway Media Gateway SCN SCN SCN SCN SCN SCN RTP RTP RTP RTP RTP RTP H.248’s Role H.323 Forum – November 2002 – New York, NY, USA

  15. Security • ITU-T Recommendation H.235 addresses the security needs of H.323 • Features signaling security protection of H.225.0 and H.245 in terms of cryptographic authentication, message integrity, (privacy), confidentiality and key management • H.235 defines RTP media payload encryption and will also adopt SRTP in the next version • H.235 Version 3 scheduled for May 2003 H.323 Forum – November 2002 – New York, NY, USA

  16. Quality of Service (QoS) • QoS is getting a lot of focus, with work is on-going in a number of areas: • QoS architecture • Service classification • Call processing performance • Techniques and procedures for service priority • Signaling to transport domains • QoS management • QoS policy server signaling • Error resilience H.323 Forum – November 2002 – New York, NY, USA

  17. Multimedia Architecture • Quality of Service and End-to-End Performance • Accessibility (e.g., text/total conversation) • Security • Interoperability with legacy PSTN systems, as well as other H.32x systems • Overall system architecture and development of new protocols H.323 Forum – November 2002 – New York, NY, USA

  18. Mobility • Introduce signaling to H.323 and other H.32x systems to facilitate user, terminal, and service mobility • Recently published: • H.501 - Mobility management and inter-/intra domain communication • H.510 - Mobility within H.323 systems • H.530 - Security procedures for H.510 • Active work in the area of presence and instant messaging H.323 Forum – November 2002 – New York, NY, USA

  19. ETS • Emergency Telecommunication Services: generalization from PSTN (E.106) to IP transport and associated multimedia content • New question: Q.I (Oct/2002) • New Recommendation F.706 (May/2003) on International Multimedia ETS, extending E.106 to IP transport • Focuses on priority, security, and availability during emergency situations for authorized disaster relief users H.323 Forum – November 2002 – New York, NY, USA

  20. H.323 Version 4 and Beyond

  21. H.323 at Present • Widely used for the application of VoIP • Video conferencing market growing: enterprise, educational institutions, and service provider markets • Good integration with the PSTN • Version 4 primarily focused on features that enabled it to excel in the voice wholesale market • Wide range of products available H.323 Forum – November 2002 – New York, NY, USA

  22. Recent Enhancements • Annex Gv2 – Communication between and within a domain • Annex P/H.323 – Modem over IP • H.460.1 – Framework for the Generic Extensibility Framework • H.460.2 – Number portability • H.460.3 – Circuit status map • H.460.4 – Call priority designation • H.460.5 – Duplicate Q.931 IEs H.323 Forum – November 2002 – New York, NY, USA

  23. Recent Enhancements (cont.) • H.460.6 – Extended Fast Connect • H.460.7 – Digit maps • H.460.8 – Querying for alternate routes • H.460.9 – QoS monitoring/reporting H.323 Forum – November 2002 – New York, NY, USA

  24. Status of H.323v5 • Scheduled for approval in May 2003 • Focus is on stability • Deliberate attempt to reduce the number of changes over previous revisions • Corrections and clarifications are being applied as necessary • Most new features appear as optional extensions to the base protocol (H.460.x series documents) • Few minor enhancements H.323 Forum – November 2002 – New York, NY, USA

  25. Next Steps • Quality of Service • Provisioning and management • Residential deployments • Large video conferencing networks • Security enhancements (SRTP adoption, etc.) • IP networking issues (firewall, NAT, IPv6) • Address resolution and Gatekeeper discovery via the H.323 URL • ENUM support H.323 Forum – November 2002 – New York, NY, USA

  26. Next Steps (cont.) • Directory services integration (LDAP) • Security enhancements • Making it more usable • Interoperability • Telephone for audio, PC for video/data • Improved data applications (remote PC control, etc.) • Simplifying user setup and maintenance (“just plug it in”) H.323 Forum – November 2002 – New York, NY, USA

  27. Thank You! H.323 Forum – November 2002 – New York, NY, USA

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