Signalling System No. 7 - ISDN User Part Signalling Procedures - Series Q: Switching and Signalling Specifications of Signalling System No. 7 - ISDN User Part Study Group 11
This Recommendation describes the ISDN User Part signalling procedures for the set-up and clear down of national and international ISDN connections. Actions common for all types of exchanges are described only once. Different or additional actions required in an exchange are specified in a separate clause applicable to that type of exchange.