Extensions to the Session Initiation Protocol (SIP) for the support of the Call Completion Services for the European Telecommunications Standards Institute
This document specifies the extensions to the Session Initiation Protocol (SIP) for the call completion simulation services provided in the context of ETSI Next Generation Networks (NGN). This document describes two SIP event packages that enable monitoring of queues. These event packages are intended for the limited use of Completion of Calls to Busy Subscribers (CCBS) and Completion of Calls on No Reply (CCNR).