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Total conversation is an ITU standard of simultaneous video, voice and text service in telecommunications. Total conversation allows people in two or more locations to: (a) see each other, (b) hear each other, and (c) conduct a text interaction (real-time text) with each other, or choose to communicate with any combination of those three modes and to do so in real-time.〔(Total Conversation explained at realtimetext.org )〕 The standard was defined in ITU-T recommendation F.703〔(F.703 : Multimedia conversational services )〕 of 2000 as "an audiovisual conversation service providing bidirectional symmetric real-time transfer of motion video, text and voice between users in two or more locations". == Application == * Conference call for businesses will need to use audio and text and may use video to share documents. * Deaf people using sign language would be more than satisfied to call each other with video. * Deaf people using sign language can also call, and be called by hearing people using Video Relay Service. * Hard of hearing people to call each other directly with voice and text and even video for lip-reading. * Hard of hearing and deaf people who do not use sign language (orally and late deafened) need to access a Text Relay Service with an audio plus text call in order to be able to speak but also to receive captions. * Text-only call is the only way to make a call for deaf-blind user using Braille display. * Text call mixed to audio feedback is the only way to make a call for speech disabled user * video, text and audio combined call is the only suitable way to make a call for cognitive disabled user. * Text only call might be convenient in situation when audio communication is not permitted, available or dangerous (noisy situation, low bandwidth). * Support and hot line might be contacted with an audio-only call and add a video stream if the user needs to show the actual issue he or she is facing on a device. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Total Conversation」の詳細全文を読む スポンサード リンク
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