This Recommendation defines a protocol that supports multipoint text conversation, commonly
known as chatting. It uses services provided by Recommendations T.122 (MCS) and T.124 (GCC)
also in their light profile specified by Annex C/T. 120.
ITU-T T.134-1998 history
1998ITU-T T.134-1998 Text Chat Application Entity - Series T: Terminals for Telematic Services Study Group 16; 16 pp