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适用范围：This International Standard specifies the signalling protocol for the support of the Message Centre Monitoringsupplementary service (SS-MCM) as well as the Mailbox Identification supplementary service (SS-MID) at theQ reference point between Private Integrated services Network eXchanges (PINXs) connected together withina Private Integrated Services Network (PISN).The supplementary service MCM enables a Served User to get informed by a Message Centre about thestatus and status changes of messages stored in that Served Users Mailbox.The supplementary service MID enables a Message Centre to identify a specific mailbox of a Served User incase the Served User has more than one mailbox within the Message Centre. In addition SS-MID enables aServed User to authenticate himself/herself at a specific mailbox located within the Messages Centre.The Q reference point is defined in ISO/IEC 11579-1.Service specifications are produced in three stages and according to the method specified in ETS 300 387.This International Standard contains the stage 3 specification for the Q reference point and satisfies therequirements identified by the stage 1 and stage 2 specifications in ISO/IEC 20116.The signalling protocol for SS-MCM and SS-MID uses certain aspects of the generic procedures for thecontrol of supplementary services specified in ISO/IEC 11582.This International Standard also specifies additional signalling protocol requirements for the support ofinteractions at the Q reference point between SS-MCM as well as SS-MID and other supplementary servicesand ANFs.NOTE Additional interactions that have no impact on the signalling protocol at the Q reference point can be found inthe relevant stage 1 specifications.