CAN/CSA-ISO/IEC 15054-01

1ScopeThis International Standard specifies the signalling protocol for the support of the additional network feature Call Int erception (ANF-CINT) at the Q reference point between Private Integrated Services Network Exchanges (PINX) connected together within a Private Integrated Services Network (PISN).ANF-CINT is an additional network feature which enables calls that can not be completed due to certain conditions to be redirected to a predetermined intercepted-to user.The Q reference point is defined in ISO/IEC 11579-l.Service specifications are produced in three stages and acc ording to the method specified in CCITT Recommendation I.130. This International Standard contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ISO/IEC 15053.The signalling protocol for ANF-CINT operates on top of the signalling protocol for basic circuit switched call control, as specified in ISO/IEC 11572, and uses certain aspects of the generic procedures for the control of supplementary services specified in ISO/IEC 11582.This International Standard also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between ANF-CINT and other supplementary services and ANFs.Note - Additional interactions that have no impact on the signalling protocol at the Q reference point can be found in the relevant stage 1 specifications.This International Standard is applicable to PINXs which can interconnect to form a PISN.