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Real-time text

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Real-time text (RTT) is streaming text that is continuously transmitted as it is typed or otherwise composed. It allows conversational use of text, where people interactively converse with each other.

Use over instant messaging

Real-time text is found in some instant messaging software, including AOL Instant Messenger's "Real-Time IM"[1] feature. Real-time text is also possible over any Jabber or XMPP compatible chat networks, including those used by Apple iChat, Cisco WebEx, and Google Talk, by using appropriate software that has a real-time text feature. In most software, the feature can be turned on/off, just like other chat features such as audio or video.

Use by the deaf

Real-time text is frequently used by the deaf, including in IP-Relay services and TDD/TTY devices. Real-time text allows the other person to read immediately, without waiting for the sender to finish composing their sentence/message. This allows conversational use of text, much like a hearing person can listen to someone speaking in real-time.

Use in collaboration

Collaborative real-time editing, including Apache Wave and EtherPad, is the utilization of real-time text for shared editing, rather than for conversation. Split screen chat, where conversational text appears continuously, is also considered real-time text.

Captioning and other uses

Real-time text is used in closed captioning when captions are being streamed live continuously during live events. Transcription services including Remote CART frequently use real-time text, where text is streamed live to a remote display. Also, real-time text provides an enhancement to text messaging on mobile phones, via real-time texting apps.

Real-time text protocols

Real-time text protocols include Text over IP designed around ITU-T T.140,[2] IETF RFC4103,[3] RFC5194,[4] and XMPP/Jabber Extension Protocol XEP-0301.[5]

Total Conversation

According to ITU-T Multimedia Recommendation F.700,[6] Total Conversation defines the simultaneous use of audio, video and real-time text. An instant messaging program that can enable all three features simultaneously, would be compliant. Real time text is an important part of it.

History

Real-time text is also historically found in the old UNIX talk (software), BBS software such as Celerity BBS, and older versions of ICQ messaging software.

See also

References

  1. ^ AOL Instant Messenger "Real-Time IM"
  2. ^ ITU-T T.140 - Protocol for multimedia application text conversation
  3. ^ IETF RFC4103 - RTP Payload for Text Conversation
  4. ^ IETF RFC5194 - Framework for Real-Time Text over IP Using SIP
  5. ^ XMPP/Jabber XEP-0301 - In-Band Real-Time Text
  6. ^ ITU-T F.700 - Framework Recommendation for multimedia services


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