Signalling System No. 7 - ISDN User Part Formats and Codes Addendum 1: Series Q: Switching and Signalling Specifications of Signalling System No. 7 - ISDN User Part Study Group 11
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,