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ITU-T T.62 Control procedures for teletex and Group 4 facsimile services
ITU-T D Supplement 3 Handbook on the methodology for determining costs and establishing national tariffs
ITU-T I.411 (03/93) ISDN user-network interfaces, reference configuration
ITU-T Q.601 to Q.695 Annex A Lists and meanings of FITEs, BITEs and SPITEs - Representation of information contents of signals of the signalling systems
ITU-T Q.734.1 Stage 3 description for multiparty supplementary services using Signalling System No. 7 : Conference calling
ITU-T Q.735 Stage 3 description for community of interest supplementary services using signalling system no. 7, Clause 1: Closed User Group (CUG), Clause 3: Multilevel precedence and preemption
ITU-T Q.82.2 Stage 2 description for call offering supplementary services : Call forwarding
ITU-T Q.82.3 Stage 2 description for call offering supplementary services: Call deflection
ITU-T Q.733.2 Stage 3 description for call completion supplementary services using Signalling System No. 7 : Call hold (HOLD)
ITU-T Q.723 AMD 1 Q.723 (1988) Amendment 1
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