Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 8: User-to-User Signalling (UUS) supplementary service [ITU-T Recommendation Q.737, clause 1 (1997) modified] (Endorsed by AENOR in March of 2004.)

Die Norm herausgegeben am 1.3.2004

Integrated Services Digital Network (ISDN);Signalling System No.7;ISDN User Part (ISUP) version 2 for the international interface;Part 9: Closed User Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993), modified] (Endorsed by Asociación Espanola de Normalización in June of 2022.)

Die Norm herausgegeben am 1.6.2022

Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 3 for the international interface; Part 9: Closed User Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993), modified] (Endorsed by AENOR in December of 2004.)

Die Norm herausgegeben am 1.12.2004

Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 9: Closed User Group (CUG) supplementary service [ITU-T Recommendation Q.735, clause 1 (1993) modified] (Endorsed by AENOR in March of 2004.)

Die Norm herausgegeben am 1.3.2004

Integrated Services Digital Network (ISDN);Completion of Calls to Busy Subscriber (CCBS) supplementary service;Service description (Endorsed by Asociación Espanola de Normalización in July of 2022.)

Die Norm herausgegeben am 1.7.2022

Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Service description (Endorsed by AENOR in March of 2004.)

Die Norm herausgegeben am 1.3.2004

Integrated Services Digital Network (ISDN);Completion of Calls to Busy Subscriber (CCBS) supplementary service;Functional capabilities and information flows (Endorsed by Asociación Espanola de Normalización in July of 2022.)

Die Norm herausgegeben am 1.7.2022

Integrated Services Digital Network (ISDN);Completion of Calls to Busy Subscriber (CCBS) supplementary service;Digital Subscriber Signalling System No. one (DSS1) protocol;Part 1: Protocol specification (Endorsed by Asociación Espanola de Normalización in July of 2022.)

Die Norm herausgegeben am 1.7.2022

Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification (Endorsed by AENOR in April of 2005.)

Die Norm herausgegeben am 1.4.2005

Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification (Endorsed by AENOR in April of 2005.)

Die Norm herausgegeben am 1.4.2005