CAN/CSA-ISO/IEC 15505-01

Scope
 
This International Standard specifies supplementary service Message Waiting Indication (SS-MWI), which is related, but not
limited, to various basic services supported by Private Integrated Services Networks (PISNs). Basic services are specified in ISO/IEC 11574.
 
This supplementary service MWI enables a Served User to be sent a Message Waiting Indication and also enables this Message Waiting Indication to be cancelled.
 
Service specifications are produced in three stages, according to the method described in CCITT Rec. I.130. This International
Standard contains the stage 1 and stage 2 specifications of SS- MWI. The stage 1 specification (clause 6) specifies the
supplementary service as seen by users of PISNs. The stage 2 specification (clause 7) specifies the functional entities involved in the supplementary service and the information flows between them.