Recommendation Q.2931 provides basic call and connection control for point-to-point connections in a B-ISDN. This amendment has been prepared to allow the creation of Recommendation Q.2965.1 to contain all the information on the encoding of the quality of service parameter information element and the related procedures in a manner that is consistent with the second edition of Recommendation I.356. This amendment is issued in conjunction with Recommendation Q.2965.1. Specifically, this amendment includes support for the following Recommendations: - ITU-T Recommendation I.356 (1996), B-ISDN ATM layer cell transfer performance. - ITU-T Recommendation Q.2965.1 (1999), Digital subscriber signalling system No. 2 - Support of quality of service classes.