T.120 is a suite of point-to-multipoint communication protocols for teleconferencing, videoconferencing, and computer-supported collaboration. It provides for application sharing, online chat, file sharing, and other functions. The protocols are standardised by the ITU Telecommunication Standardization Sector (ITU-T).
T.120 has been implemented in various real-time collaboration programmes, including WebEx and NetMeeting. IBM Sametime switched from the T.120 protocols to HTTP(S) in version 8.5.
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.
The T.123 standard specifies that T.120 protocols use network port 1503 when communicating over TCP/IP.
Components Number Title Status T.120 Data protocols for multimedia conferencing T.121 Generic application template T.122 Multipoint communication service - Service definition T.123 Network-specific data protocol stacks for multimedia conferencing T.124 Generic Conference Control T.125 Multipoint communication service protocol specification T.126 Multipoint still image and annotation protocol T.127 Multipoint binary file transfer protocol T.128 Multipoint application sharing T.130 Realtime architecture T.131 Network specific mappings T.132 Realtime link management T.133 Audio visual control services T.134 Text chat application entity T.135 User-to-reservation system transactions within T.120 conferences T.136 Remote device control application protocol T.137 Virtual meeting room management for multimedia conferencing audio-visual control T.RES Reservation services T.TUD User reservation
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