Recommendation Q.2931 provides basic call and connection control for point-to-point connections in a B-ISDN. Amendment 2 to Recommendation Q.2931 has been prepared to allow signalling of AAL parameters associated with ATM Adaptation Layers specified in the I-series Recommendations since the original publication of Recommendation Q.2931 and is designed to be compatible with implementations conforming to the first edition of Recommendation Q.2931 (1995). The changes from Recommendation Q.2931 (1995) specify B-ISDN call control to support advances made in the I-series Recommendations concerned with ATM Adaptation Layer protocols that have been introduced since the original publication of Q.2931 (1995). Specifically, this amendment includes support for the following Recommendations: - ITU-T Recommendation I.363.1 (1996), B-ISDN ATM Adaptation Layer specification: Type 1 AAL. - ITU-T Recommendation I.363.2 (1997), B-ISDN ATM Adaptation Layer specification: Type 2 AAL. - ITU-T Recommendation I.363.3 (1996), B-ISDN ATM Adaptation Layer specification: Type 3/4 AAL. - ITU-T Recommendation I.363.5 (1996), B-ISDN ATM Adaptation Layer specification: Type 5 AAL. - ITU-T Recommendation I.365.1 (1993), B-ISDN ATM adaptation layer sublayers: Frame relaying service specific convergence sublayer (FR-SSCS). - ITU-T Recommendation I.365.2 (1995), B-ISDN ATM adaptation layer sublayers: Service specific coordination function to provide the connection-oriented network service. - ITU-T Recommendation I.365.3 (1995), B-ISDN ATM adaptation layer sublayers: Service specific coordination function to provide the connection-oriented transport service. - ITU-T Recommendation I.366.1 (1998), Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL Type 2. - ITU-T Recommendation I.366.2 (1999), AAL Type 2 SSCS for trunking. - ITU-T Recommendation Q.2110 (1994), B-ISDN ATM adaptation layer - Service specific connection oriented protocol (SSCOP).