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International Customer Service
Phone +49 30 2601-2759
Fax +49 30 2601-1263

Standard 2001-11-01

OENORM EN 300356-18 V 4.1.2:2001-11-01

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]

Publication date
2001-11-01
Original language
English

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Publication date
2001-11-01
Original language
English

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