Integrated Services Digital Network (ISDN) - Connected Line Identification Restriction (COLR) supplementary service - Digital Subscriber Signalling System No one (DSS1) protocol - Part 1: protocol specification
Edition 2001-05-01

Integrated Services Digital Network (ISDN) - Closed User Group (CUG) supplementary service - Digital Subscriber Signalling System No one (DSS1) protocol - Part 1: protocol specification
Edition 2001-05-01

Integrated Services Digital Network (ISDN) - Call Hold (HOLD) supplementary service - Digital Subscriber Signalling System No one (DSS1) protocol - Part 1: protocol specification
Edition 2001-05-01

Integrated Services Digital Network (ISDN) - Advice of Charge (AOC) supplementary service. - Digital Subscriber Signalling System No one (DSS1) protocol - Part 1: protocol specification
Edition 2001-06-01

Integrated Services Digital Network (ISDN) - Completion of Calls on No Reply (CCNR) supplementary service - Service description
Edition 2001-12-01

Integrated Services Digital Network (ISDN) - Selective Call Forwarding (SCF) supplementary services (unconditional, busy and no reply) - Service description
Edition 2001-12-01

Telecommunication - Integrated Services Digital Network (ISDN) - Outgoing Call Barring-User Controlled (OCB-UC) supplementary service - Service description.
Edition 2001-12-01

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) - Inter-exchange signalling protocol - Message waiting indication supplementary service (V1.2.1)
Edition 2006-05-01

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