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]
Number | Title | Status | Refs |
---|---|---|---|
T.120 | Data protocols for multimedia conferencing | In force | [6] |
T.121 | Generic application template | In force | [7] |
T.122 | Multipoint communication service - Service definition | In force | [8] |
T.123 | Network-specific data protocol stacks for multimedia conferencing | In force | [9] |
T.124 | Generic Conference Control | In force | [10] |
T.125 | Multipoint communication service protocol specification | In force | [11] |
T.126 | Multipoint still image and annotation protocol | In force | [12] |
T.127 | Multipoint binary file transfer protocol | In force | [13] |
T.128 | Multipoint application sharing [lower-alpha 1] | In force | [14] [15] |
T.130 | Realtime architecture | ? | [15] |
T.131 | Network specific mappings | ? | [15] |
T.132 | Realtime link management | ? | [15] |
T.133 | Audio visual control services | ? | [15] |
T.134 | Text chat application entity | In force | [16] |
T.135 | User-to-reservation system transactions within T.120 conferences | In force | [17] |
T.136 | Remote device control application protocol | Superseded by H.281 | [18] [19] |
T.137 | Virtual meeting room management for multimedia conferencing audio-visual control | In force | [20] |
T.RES | Reservation services | ? | [3] [15] |
T.TUD | User reservation | ? | [3] [15] |
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