The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecommunication Union. The lï’lJ-T is responsible for studying technical, operating and iariff questions and issuing Recommendations on them with a view t
ITU-T Q.700-1993 history
1993ITU-T Q.700-1993 Introduction to CCITT Signalling System No. 7 - Specifications of Signalling System No. 7 (Study Group XI) 23 pp