This Recommendation defines performance parameters and objectives for call processing in B-ISDNs. 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. Call processing delay parameters for point-to-point, single connection calls on 64 kbit/s channels are defined in Recommendation I.352. These parameters are usedwhere relevant. Additional call processing performance parameters are defined for those call processing aspects that are new with B-ISDN. The parameters include QOS relevant network performance parameters (objectives) and the relationship to GOS parameters relevant to network design (no objectives) in order toprovide a consistent approach between service requirements and network design. These parameters are specified in terms of reference events and measurement points defined in Recommendation I.353.