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Question 4/16 – Advanced functions for H.300-series systems and beyond
(Continuation of Questions 4/16, 24/16, 25/16 and 29/16)


ITU-T Study Group 16 has focused on the H.300-, H.248- and T.120-series standardization of real-time audiovisual conversational system platforms over various types of network. The network infrastructure to support these multimedia system platforms is converging to the IP-based one, which has been developed to provide rich Internet services such as e-mail, hypertext multimedia data retrieval, multimedia file transfer, multimedia streaming, presence, and instant messaging. We have a good opportunity of utilizing these Internet services and other new service features in conjunction with audio, video and data capabilities of the multimedia system platforms standardized by SG 16. This Question addresses how to provide advanced functions on top of the SG 16 defined platforms for such multimedia services as videophone, videoconferencing, data conferencing, telepresence, distance learning, e-health, interactive multimedia information distribution, real-time multimedia collaboration in the NGN environments. Aspects to be addressed or built upon include multimedia directory services, quality of service and quality of experience, multimedia security, and multimedia mobility. These aspects should be studied together in an integrated way for next generation multimedia systems.

Study items

Study items to be considered include, but are not limited to:

  • Architecture and protocols to integrate advanced service features such as directory services, QoS, security and mobility with the SG 16 defined multimedia system platforms
  • Convergence of telecommunication and broadcasting services
  • QoS mechanisms for multimedia systems and coders, including preferred QoS signalling methods, end-to-end application level methods to provide better QoS in lossy networks, common API or interfaces to network-based QoS mechanisms, advanced methods for optimizing end-to-end latency and various QoS parameters, and other aspects of end-to-end performance as perceived by the user
  • Service level QoS classification of multimedia applications and services and application service level agreement (SLA) definitions
  • Descriptions of network QoS capabilities in terms of network QoS classes and/or network SLA definitions
  • Mapping between multimedia application QoS requirements and network QoS capabilities
  • Performance monitoring and measurement functions for multimedia applications
  • Understand the principles, scenarios and security architectures of federated trust domains and how such concepts of trust federations could best be applicable to multimedia applications over NGN and other packet-based networks
  • Identify the common and specific security requirements of next generation multimedia applications and services such as video conferencing, collaboration
  • Address security multimedia environments with mobility constraints; further develop H.530 in distributed secured, multimedia networks; clarify security aspects of “multimedia over wireless”
  • Encryption of call signalling and media flows within H-series systems and related applications
  • Robust and reliable key management; e.g., acknowledged key update
  • Further develop user, terminal and service mobility for H.323 and H.324, as needed
  • Ensure interworking with NGN to support multimedia mobility across networks of different types
  • Ensure that a possible future advanced multimedia system (AMS) terminal in its initial version supports mobility
  • Study the requirements for metadata in descriptions of user profile, terminal capability, access network characteristics and service profile that relate to service mobility
  • Considerations on how to help measure and mitigate climate change


Tasks include, but are not limited to:

  • Definition of new services and their technical requirements capture
  • Use of directory services, presence, etc. in H.300-series systems
  • Enhanced QoS mechanisms for H.300-series and AMS
  • QoS signalling in application service provider equipment and possible future terminals
  • Input to terms of reference for audio and video coders that maximize QoS in lossy networks
  • Input to IETF, 3GPP, SG 11, SG 12 and SG 13 on multimedia QoS needs
  • Security requirements study with scenarios and architecture(s) for multimedia applications and services benefiting from concepts of trust federations
  • Specification of handover procedures where active sessions can be maintained during location changes and terminal changes
  • Specification of interworking with NGN networks to support generalised mobility handling
  • Enhancement and maintenance of H.350 sub-series, H.360, H.361, H.510 and H.530

An up-to-date status of work under this Question is found in the SG 16 work programme (




  • H.225.0, H.245, H.248, H.310, H.320, H.321, H.322, H.323, H.324, H.460.x
  • G.1000, G.1010, Y.1540, Y.1541
  • F.700-series, X.509, X.800-series
  • Q.1707


  • • 1, 2, 3, 6, 7, 10, 12, 14, 21, 22/16

Study Groups:

  • SG 2 on management security
  • SG 9 on multimedia security for IPCablecom, CableHome systems and on home networking security
  • SG 11 for QoS Signalling
  • SG 12 on performance
  • SG 13 on NGN and on mobility (including security aspects of mobile communications and lawful intercept)
  • SG 17 on security, web services, languages and directories

Other Bodies:

  • 3GPP for IMS multimedia security, mobility
  • ATIS for T1M1sec management plane security, T1S1sec signalling security including SS7 security
  • ETSI TISPAN (QoS, security), TC SEC (SAGE)
  • IEEE for 802.x WLAN & Link Layer security, P1363 PKI
  • IETF for Internet supported services, QoS, security, IP mobility
  • IMTC for interoperability
  • IP/MPLS Forum for QoS, security
  • ISO/IEC JTC1/SC27 for digital signature, key management, non-repudiation, etc
  • ISO/IEC JTC1/SC29 for content and copy protection, watermarking, IPMP, secure JPEG2000, etc
  • Liberty Alliance Project for ID-FF Identity Federations, Identity Management, SSO, network wide authentication
  • MSF for NGN security
  • NIST for AES and other crypto algorithms, FIPS security documents, security guidelines, etc
  • OASIS for Web services security, SAML, XTASS, XACML
  • W3C for XML signature, XML encryption, XACL


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