T.120 is a suite of point-to-multipoint communication protocols for teleconferencing, videoconferencing, and computer-supported collaboration.[1] It provides for application sharing, online chat, file sharing, and other functions. The protocols are standardised by the ITU Telecommunication Standardization Sector (ITU-T).[1]

T.120 has been implemented in various real-time collaboration programmes, including WebEx and NetMeeting.[2][3] IBM Sametime switched from the T.120 protocols to HTTP(S) in version 8.5.[4]

The prefix T designates the ITU subcommittee that developed the standard, but it is not an abbreviation. The ITU (re)assigns these prefixes to committees incrementally and in alphabetic order.[5]

The T.123 standard specifies that T.120 protocols use network port 1503 when communicating over TCP/IP.[5]

Components

NumberTitleStatusRefs
T.120Data protocols for multimedia conferencingIn force[6]
T.121Generic application templateIn force[7]
T.122Multipoint communication service - Service definitionIn force[8]
T.123Network-specific data protocol stacks for multimedia conferencingIn force[9]
T.124Generic Conference ControlIn force[10]
T.125Multipoint communication service protocol specificationIn force[11]
T.126Multipoint still image and annotation protocolIn force[12]
T.127Multipoint binary file transfer protocolIn force[13]
T.128Multipoint application sharing[lower-alpha 1]In force[14][15]
T.130Realtime architecture?[15]
T.131Network specific mappings?[15]
T.132Realtime link management?[15]
T.133Audio visual control services?[15]
T.134Text chat application entityIn force[16]
T.135User-to-reservation system transactions within T.120 conferencesIn force[17]
T.136Remote device control application protocolSuperseded by H.281[18][19]
T.137Virtual meeting room management for multimedia conferencing audio-visual controlIn force[20]
T.RESReservation services?[3][15]
T.TUDUser reservation?[3][15]
  1. ↑ T.128 was previously called T.Share while in draft stage.

See also

References

  1. 1 2 Clark, W. J. (1994). "Protocols for Multimedia Conferencing: An Introduction to the ITU-T T.120 series". In Hutchison, D.; Danthine, A.; Leopold, H.; Coulson, G. (eds.). Proceedings of the International COST 237 Workshop on Multimedia Transport and Teleservices. Springer-Verlag. p. 322. doi:10.1007/3-540-58759-4_43.
  2. ↑ "Evaluation of Shared Display in WebEx and VNC". Community Grids Heritage Web Server: Summer 2000–2001. Indiana University Bloomington. Section: "Network communication". Retrieved 13 March 2018.
  3. 1 2 3 United States patent 6317777B1, Rune A. Skarbo; Christopher C. Lawless & Puneet Kukkal et al., "Method for web based storage and retrieval of documents", issued 2001-11-13, assigned to Intel
  4. ↑ Chiabra, Roberto. "What's New in Sametime 8.5" (PDF). IBM DeveloperWorks. IBM. Retrieved 13 March 2018.
  5. 1 2 Zwicky, Elizabeth D.; Cooper, Simon; Chapman, D. Brent (June 2000). "Multimedia Protocols". Building Internet Firewalls (2nd ed.). O'Reilly Media. Subsection: "Packet filtering characteristics of T.120". ISBN 978-1-56592-871-8. OCLC 639935671. Retrieved 20 February 2018.
  6. ↑ "T.120 : Data protocols for multimedia conferencing". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  7. ↑ "T.121 : Generic application template". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  8. ↑ "T.122 : Multipoint communication service - Service definition". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  9. ↑ "T.123 : Network-specific data protocol stacks for multimedia conferencing". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  10. ↑ "T.124 : Generic Conference Control". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  11. ↑ "T.125 : Multipoint communication service protocol specification". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  12. ↑ "T.126 : Multipoint still image and annotation protocol". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  13. ↑ "T.127 : Multipoint binary file transfer protocol". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  14. ↑ "T.128 : Multipoint application sharing". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  15. 1 2 3 4 5 6 7 Freedman, Alan. "T.120". Computer Desktop Encyclopedia. The Computer Language Company. Retrieved 3 March 2018.
  16. ↑ "T.134 : Text chat application entity". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  17. ↑ "T.135 : User-to-reservation system transactions within T.120 conferences". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  18. ↑ "T.136 : Text chat application entity". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  19. ↑ "H.281 : A far end camera control protocol for videoconferences using H.224". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
  20. ↑ "T.137 : Virtual meeting room management for multimedia conferencing audio-visual control". ITU.int. International Telecommunication Union. Retrieved 3 March 2018.
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