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ÖNORM EN 300356-18 V 4.1.2:2001-11

Действует
Integrated Services Digital Network (ISDN) - Signalling System No.7 (SS7) - ISDN User Part (ISUP) version 4 for the international interface - Part 18: Completion of Calls to Busy Subscriber (CCBS) supplementary service [ITU-T Recommendation Q.733, clause 3 (1997), modified]
ÖNORM EN 300356-18 V 4.1.2:2001-11
Действует