1 Scope

24.4063GPPMessage Waiting Indication (MWI): Protocol specificationPSTN/ISDN simulation servicesTISPANTS

The present document specifies the stage three Protocol Description of the Message Waiting Indication (MWI) service, based on stage one and two of the ISDN MWI supplementary services. Within the TISPAN NGN Release1 Next Generation Network (NGN) the stage 3 description is specified using the IP Multimedia Call Control Protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP).