This Recommendation defines performance parameters and objectives for call processing in B-ISDNs for switched Virtual Channel Connections (VCCs). The B-ISDN call processing parameters defined in this Recommendation are applicable to point-to-point (Type 1) and point-to-multipoint (Type 2) connection topologies. The QoS relevant network performance objectives provided in this Recommendation are based on the general principles and generic performance parameters of ITU-T Rec. I.350. New performance-related aspects, associated with B-ISDN call processing functions providing access or disengagement, include the addition or release of a party to an existing B-ISDN connection. In a B-ISDN, a virtual connection can generally be either a Virtual Channel Connection (VCC) or a Virtual Path Connection (VPC). Since call processing capabilities are currently defined only for VCCs, a virtual connection within the context of this Recommendation is a VCC.