Advice of Charge: Charging Information During the Call (AOC-D) - Integrated Services Digital Network (ISDN) - Service Capabilities - Supplementary Services in ISDN (Study Group I) 11 pp
As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT
ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization Sector (ITU-T) was
created as of 1 March 1993. Similar