T.120

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.
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gollark: As I said, you could use the solar system's most high-powered gravitational confinement fusion reactor, it's just a bit hard to get to.
gollark: I suppose most would work.
gollark: > ITER (originally the International Thermonuclear Experimental Reactor[1]) is an international nuclear fusion research and engineering megaproject, which will be the world's largest magnetic confinement plasma physics experiment. It is an experimental tokamak nuclear fusion reactor that is being built next to the Cadarache facility in Saint-Paul-lès-Durance, in Provence, southern France.[2]
gollark: What?

See also

References
  1. 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. 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. 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. 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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