CAN/CSA-ISO/IEC 21991:04 (R2022) :
Information technology - Telecommunications and information exchange between systems - Corporate Telecommunication Networks - Signalling interworking between QSIG and H.323 - Call completion supplementary services (Adopted ISO/IEC 21991:2002, first edition, 2002-06-15)
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Information technology - Telecommunications and information exchange between systems - Corporate Telecommunication Networks - Signalling interworking between QSIG and H.323 - Call completion supplementary services (Adopted ISO/IEC 21991:2002, first edition, 2002-06-15)
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