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. The standard was defined in ITU-T recommendation F.703 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 there is a need to show the actual issue the user is facing on a device. Universal design Total conversation is a straightforward application of universal design principles applied to telecommunication field. This standard brings communication services to the broadest range of population including deaf people, hard of hearing people but also people who have speech impairment, people with cognitive impairment, elderly people, children, and also ... regular users. It is an enhancement of call services that provides a better experience to all. Total conversation uses video, text and audio. These media can be combined or not depending on the type of profile