Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service - Digital Subscriber Signalling System number one (DSS1) protocol - Part 6: Abstract Test Suite (ATS) and partial Protocol - Implementation eXtra Information for Testing (PIXIT) proforma specification for the network
Edition 2003-06-01

Private Integrated Services Network (PISN) - Specification, functional models and information flows - Recall supplementary service (V1.2.1)
Edition 2006-05-01

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Recall supplementary service (V1.2.1)
Edition 2004-05-01

Private Integrated Services Network (PISN) - Specification, functional models and information flows - Message waiting indication supplementary service (V1.2.1)
Edition 2004-06-01

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Advice of charge supplementary services (V1.2.1)
Edition 2004-06-01

Integrated Services Digital Network (ISDN). Completion of calls to busy subscriber (ccbs) supplementary service. Service description
Edition 1996-12-01

Integrated Services Digital Network (ISDN). Completion of Calls to Busy Subscriber (CCBS) supplementary service. Digital Subscriber Signalling System no 1 (DSS1) protocol. Part 1: protocol specification
Edition 1998-10-01

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Call offer supplementary service (V1.3.1)
Edition 2003-12-01

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call offer supplementary service (V1.3.1)
Edition 2006-05-01

Private Integrated Services Network (PISN) - Specification, functional model and information flows - Do not disturb and do not disturb override supplementary services (V1.3.1)
Edition 2003-12-01