Interworking between ISDN Access and Non-ISDN Access over ISDN User Part of Signalling System No.7 Addendum 1: DSS1-SS7 Interworking for Call Completion on No Reply - Series Q: Switching and Signalling Interworking of Signalling Systems - Interworking bet
Addendum 1 to ITU-T Recommendation Q.699 was prepared by ITU-T Study Group 11
(1 997-2000) and was approved under the WTSC Resolution No. 1 procedure on 3 December 1999.