Summary

This Recommendation provides general information for ISDN supplementary services. It describes generic procedures, network specific facilities and end-to-end signalling methods. It also contains the generic format for the supplementary service descriptions contained in Recommendations Q.731 to Q.737, to be used in conjunction with the ISDN user part (ISUP) defined in Recommendations Q.761 to Q.764 and Recommendation Q.767 "Application of the ISDN user part of CCITT signalling system No. 7 for international ISDN connections". A listing of the currently defined supplementary services is included as well.