Total conversation is an ITU standard of simultaneous video, voice and text service in telecommunications.
[1] The standard was defined in ITU-T recommendation F.703[2] 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".
A number of European companies including 4CTel, Aupix, IVèS, nWise, Omnitor, and Orange Labs produced implementations.
Total conversation basically provides a multi-media call services with specific media enabled.
Thirdly, IMS is much more ambitious and define a whole architecture, including all internal interfaces and billing and physical infrastructure.