Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network

Standard published on 23.6.2000

Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network

Standard published on 20.11.2001

Integrated Services Digital Network (ISDN); Signalling System No.7; Signalling interworking specification for ISDN User Part (ISUP) version 2

Standard published on 21.2.1995

Private Telecommunication Network (PTN); Specification, functional models and information flows; Call offer supplementary service

Standard published on 15.11.1994

Private Integrated Services Network (PISN); Specification, functional models and information flows; Call offer supplementary service [ISO/IEC 14841 (1996), modified]

Standard published on 26.3.1999

Private Integrated Services Network (PISN); Specification, functional model and information flows; Call offer supplementary service [ISO/IEC 14841 (1996) modified]

Standard published on 16.6.2003

Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Call offer supplementary service

Standard published on 15.11.1994

Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service [ISO/IEC 14843 (1996), modified]

Standard published on 26.3.1999

Private Integrated Services Network (PISN); Inter-exchange signalling protocol; Call offer supplementary service [ISO/IEC 14843 (2003), modified]

Standard published on 5.1.2004

Private Telecommunication Network (PTN); Specification, functional models and information flows; Do not disturb and do not disturb override supplementary services

Standard published on 15.11.1994