PresentsPresents

H.323 Forum 2002H.323 Forum 2002

ITU-T SG16ITU-T SG16With Focus on H.323 ActivitiesWith Focus on H.323 Activities

Presented by Paul E. Jones

Rapporteur ITU-T Q2/16

Cisco Systems

H.323 Forum – November 2002 – New York, NY, USA

Sponsored in part by:

Multimedia ConvergenceMultimedia 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

Sponsored in part by:

Major Activities of SG16Major 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

Sponsored in part by:

ITU-T SG16 Structure

WP1

Facsimile and Modems

WP2

MM Platform and Interworking

WP3

Media Coding

WP4

MM Framework

E - Media coding

6 - Advanced video coding

7 - Wideband speech coding

8 - Speech coding at 4 Kbit/s

9 - Variable bit-rate speech coding

10 - Software tools and maintenance of speech coding standards

15 - Distributed speech recognition/distributed speaker verification

D - Interoperability of MM Systems and Services

F - Quality of Service and End to End Performance

G - Security

1 - MM Systems, Terminals and Data Conferencing

2 - MM over Packet Networks (H.323)

3 - Infrastructure and Interoperability

4 – Video and Data Conferencing using Internet Supported Services

5 - Mobility for MM Systems and Services

H - Accessibility to MM Systems and Services

11 - Modems

12 - DCE-DCE protocols for the PSTN and ISDN

13 - DTE-DCE Interfaces and Protocols

14 - Facsimile terminals

A - MediaCom 2004

B - MM Architecture

C - MM Applications and Services

ETS – Emergency Telecommunications Services

H.323 Forum – November 2002 – New York, NY, USA

Sponsored in part by:

Voice CodingVoice 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

Sponsored in part by:

Video CodingVideo 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

Sponsored in part by:

Multimedia SignalingMultimedia 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

Sponsored in part by:

ModemsModems

• 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

Sponsored in part by:

FaxFax

• 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

Sponsored in part by:

Data ConferencingData 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

Sponsored in part by:

Call and Conference ControlCall 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

Sponsored in part by:

Media Gateway ControlMedia 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

Sponsored in part by:

H.248’s RoleH.248’s Role

MediaGatewayController

(“Softswitch”)

H.323

H.248

SCN RTP

MediaGateway

SCN RTP

MediaGateway

SCN RTP

MediaGateway

SCN RTP

MediaGateway

SCN RTP

MediaGateway

SCN RTP

MediaGateway

H.323 Forum – November 2002 – New York, NY, USA

Sponsored in part by:

SecuritySecurity

• 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

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Quality of Service (QoS)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

Sponsored in part by:

Multimedia ArchitectureMultimedia 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

Sponsored in part by:

MobilityMobility

• 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

Sponsored in part by:

ETSETS

• 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 Version 4 and BeyondH.323 Version 4 and Beyond

H.323 Forum – November 2002 – New York, NY, USA

Sponsored in part by:

H.323 at PresentH.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

Sponsored in part by:

Recent EnhancementsRecent 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

Sponsored in part by:

Recent Enhancements (cont.)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

Sponsored in part by:

Status of H.323v5Status 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

Sponsored in part by:

Next StepsNext 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

Sponsored in part by:

Next Steps (cont.)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

Sponsored in part by:

Thank You!