Overview of Methodology for Developing Management Services - General Recommendations on Telephone Switching and Signalling Functions and Information Flows for Services in the ISDN (Study Group XI) 7 pp
The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to