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Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call completion supplementary services [ISO/IEC 13870 (2003), modified]

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 1: Protocol specification

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 3: Protocol Implementation Conformance Statement (PICS) proforma specification

Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol - Signalling network layer for circuit-mode basic call control - Part 7: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network

Access and Terminals (AT) - 2048 kbit/s digital unstructured and structured leased lines (D2048U and D2048S) - Network interface presentation

Access and Terminals (AT) - 2048 kbit/s digital structured leased line (D2048S) - Connection characteristics

Access and Terminals (AT) - 2048 kbit/s digital structured leased line (D2048S) - Terminal equipment interface

Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call intrusion supplementary service [ISO/IEC 14846 (2003), modified]

Digital Enhanced Cordless Telecommunications (DECT) - Generic Access Profile (GAP)

Access and Terminals (AT) - Ordinary quality voice bandwith 2-wire analogue leased line (A2O) - Connection charactristics and network interface presentation

Access and Terminals (AT) -Special quality voice bandwith 2-wire analogue leased line (A2S) - Connection charactristics and network interface presentation

Access and Terminals (AT) - Ordinary and Special quality voice bandwith 2-wire analogue leased lines (A2O and A2S) - Terminal equipment interface