ITU-T H-Series Recommendations

(last updated: 31-Oct-2000 11:25)

H Series: Audiovisual and Multimedia Systems

Characteristics of Transmission Channels Used for Other Than Telephone

  1. H.11 (10/84)
    Characteristics of circuits in the switched telephone network.
  2. H.12 (10/84)
    Characteristics of telephone-type leased circuits.
  3. H.13 (11/88) (same as O.71)
    Characteristics of an impulsive noise measuring instrument for telephone-type circuits.
  4. H.14 (10/84)
    Characteristics of group links for the transmission of wide-spectrum signals.
  5. H.15 (10/84)
    Characteristics of supergroup links for the transmission of wide-spectrum signals.
  6. H.16 (10/84) (same as O.72)
    Characteristics of an impulsive-noise measuring instrument for wideband data transmission.

Use of Telephone-Type Circuits for Voice-Frequency Telegraphy

  1. H.21 (10/84)
    Composition and terminology of international voice-frequency telegraph systems.
  2. H.22 (10/84)
    Transmission requirements of international voice-frequency telegraph links (at 50, 100 and 200 bauds).
  3. H.23 (10/84)
    Basic characteristics of telegraph equipments used in international voice-frequency telegraph systems.

Telephone Circuits or Cables Used for Various Types of Telegraph

  1. H.32 (11/88) (same as R.43)
    Simultaneous communication by telephony and telegraphy on a telephone-type circuit.
  2. H.34 (10/84)
    Subdivision of the frequency band of a telephone-type circuit between telegraphy and other services.

Telephone-Type Circuits Used for Facsimile Telegraphy

  1. H.41 (1984)
    Phototelegraph transmissions on telephone-type circuits.
  2. H.42 (1984)
    Range of phototelegraph transmissions on a telephone-type circuit.
  3. H.43 (11/88) (same as T.10)
    Document facsimile transmissions on leased telephone-type circuits.

Characteristics of Data Signals

  1. H.51 (11/88) (same as V.2)
    Power levels for data transmission over telephone lines.
  2. H.52 (10/84)
    Transmission of wide-spectrum signals (data, facsimile, etc.) on wideband group links.
  3. H.53 (10/84)
    Transmission of wide-spectrum signals (data, etc.) over wideband supergroup links.

Characteristics of Visual Telephone Systems

  1. H.100 (11/88)
    Visual telephone systems.
  2. H.110 (11/88)
    Hypothetical reference connections for videoconferencing using primary digital group transmission.
  3. H.120 (03/93)
    Codecs for videoconferencing using primary digital group transmission.
  4. H.130 (11/88)
    Frame structures for use in the international interconnection of digital codecs for videoconferencing or visual telephony.
  5. H.140 (11/88)
    A multipoint international videoconference system.

Infrastructure of Audiovisual Services - General

  1. H.200 (03/93)
    Framework for Recommendations for audiovisual services.

Transmission Multiplexing and Synchronization

  1. H.221 (05/99)
    Frame structure for a 64 to 1920 kbit/s channel in audiovisual teleservices.
  2. H.222.0 (02/00) + Ammend 7 (02/00)
    Information technology - Generic coding of moving pictures and associated audio information: Systems.
  3. H.222.1 (03/96)
    Multimedia multiplex and synchronization for audiovisual communication in ATM environments.
  4. H.223 (03/96) + Annex A (02/98) + Annex B (02/98) + Annex C (02/98) + Annex D (05/99)
    Multiplexing protocol for low bit rate multimedia communication.
  5. H.224 (02/00)
    A real time control protocol for simplex applications using the H.221 LSD/HSD/MLP channels.
  6. H.225.0 (09/99)
    Call Signaling Protocols and Media Stream Packetization for Packet Based Multimedia Communications Systems.
  7. H.226 (09/98)
    Channel Aggregation Protocol for Multilink Operation on Circuit-Switched Networks.

Systems Aspects

  1. H.230 (05/99)
    Frame-synchronous control and indication signals for audiovisual systems.
  2. H.231 (07/97)
    Multipoint control units for audiovisual systems using digital channels up to 1920 kbit/s.
  3. H.233 (07/95)
    Confidentiality system for audiovisual services.
  4. H.234 (11/94)
    Encryption key management and authentication system for audiovisual services.
  5. H.235 (02/98)
    Security and Encryption for H-Series (H.323 and Other H.245-Based) Multimedia Terminals.

Communication Procedures

  1. H.242 (05/99)
    System for establishing communication between audiovisual terminals using digital channels up to 2 Mbit/s.
  2. H.243 (02/00)
    Procedures for establishing communication between three or more audiovisual terminals using digital channels up to 1920 kbit/s.
  3. H.244 (07/95)
    Synchronized aggregation of multiple 64 or 56 kbit/s channnels.
  4. H.245 (02/00)
    Control protocol for multimedia communication.
  5. H.246 (02/98) + Annex C (02/00)
    Interworking of H-Series Multimedia Terminals with H-Series Multimedia Terminals and Voice/Voiceband Terminals on GSTN and ISDN.
  6. H.247 (09/98)
    Multipoint Extension for Broadband Audiovisual Communication Systems and Terminals.

Infrastructure of Audiovisual Services -- Transmission Multiplexing and

  1. H.248 (06/00)
    Control Protocol for Multimedia Communication
    aka Gateway Control Protocol.

Coding of Moving Video

  1. H.261 (03/93)
    Video codec for audiovisual services at p x 64 kbit/s.
  2. H.262 (02/00)
    Generic Coding of Moving Pictures and Associated Audio Information: Video.
  3. H.263 (02/98) + Addend (03/97)
    Video coding for low bit rate communication.

Related Systems Aspects

  1. H.281 (11/94)
    A far end camera control protocol for videoconferences using H.224.
  2. H.282 (05/99)
    Remote Device Control Protocol for Multimedia Applications.
  3. H.283 (05/99)
    Remote Device Control Logical Channel Transport.

Systems and Terminal Equipment for Audiovisual Services

  1. H.310 (09/98) + Corr 1 (02/98)
    Broadband audiovisual communication systems and terminals.
  2. H.320 (05/99)
    Narrow-band visual telephone systems and terminal equipment.
  3. H.321 (02/98)
    Adaptation of H.320 visual telephone terminals to B-ISDN environments.
  4. H.322 (03/96)
    Visual telephone systems and terminal equipment for local area networks which provide a guaranteed quality of service.
  5. H.323 (09/99) + Annex E (05/99) + Annex F (05/99) + Annex G (02/00)
    Packet Based Multimedia Communication Systems.
  6. H.324 (02/98) + Annex F (09/98) + Annex G (02/00)
    Terminal for low bit rate Multimedia Communication.
  7. H.331 (03/93)
    Broadcasting type audiovisual multipoint systems and terminal equipment.
  8. H.332 (09/98)
    H.323 Extended for Loosely Coupled Conferences.
  9. H.341 (05/99)
    Multimedia Management Information Base.
  10. H.450.1 (02/98)
    Generic Functional Protocol for the Support of Supplementary Services in H.323.
  11. H.450.2 (02/98)
    Call Transfer Supplementary Service for H.323.
  12. H.450.3 (02/98)
    Call Diversion Supplementary Service for H.323.
  13. H.450.4 (05/99)
    Call Hold Supplementary Service for H.323.
  14. H.450.5 (05/99)
    Call Park and Call Pickup Supplementary Services for H.323.
  15. H.450.6 (05/99)
    Call Waiting Supplementary Service for H.323.
  16. H.450.7 (05/99)
    Message Waiting Indication Supplementary Service for H.323.
  17. H.450.8 (02/00)
    Name Identification Supplementary Service for H.323.
  18. Supplement 1 to Series H (05/99)
    Application Profile - Sign Language and Lip-Reading Real-Time Conversation Using Low Bit-Rate Video Communication.