Stage 3 Description for Multiparty Supplementary Services Using Signalling System No. 7 Clause 1 - Conference Calling Clause 2 - Three-Party Service - Specifications of Signalling System No. 7 Study Group 11; Covering Note Information Note June 1999
The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view t