Stage 3 Description for Multiparty Supplementary Services Using DSS 1 Clause 1 - Conference Calling Clause 2 - Three-Party Service - Digital Subscriber Signalling System No. 1 Stage 3 Description for Supplementary Services Using DSS 1 Study Group XI; 65 p
Stage 3 Description for Multiparty Supplementary Services Using DSS 1 Clause 1 - Conference Calling Clause 2 - Three-Party Service - Digital Subscriber Signalling System No. 1 Stage 3 Description for Supplementary Services Using DSS 1 Study Group XI; 65