name: CCBS
full_form: Customized Calling Backup Service
context: When in-band tones/announcements are provided (see subclause 5.5.1) and CCBS is not applicable, the call control entity of the network may initiate clearing by sending a DISCONNECT message containing progress indicator #8 "in-band information or appropriate pattern now available", either not containing an Allowed Actions IE or containing an Allowed Actions IE indicating "CCBS activation is not possible", starting timer T306, and entering the "disconnect indication" state. 5.4.4.2.1.1 Receipt of a DISCONNECT message The call control entity of the MS in any state except the "null" state, the "disconnect indication" state, and the "release request" state, shall, upon receipt of a DISCONNECT message with progress indicator #8 and, either not containing an Allowed Actions IE or containing an Allowed Actions IE indicating "CCBS activation is not possible": i) if an appropriate speech traffic channel is not connected, - stop all running call control timers; - send a RELEASE message; - start timer T308; - enter the "release request" state; and - not connect to the in-band tone/announcement. ii) if an appropriate speech traffic channel is connected, attach the user connection for speech if it is not yet attached and enter the "disconnect indication" state. In that state, if upper layers request the clearing of the call, the call control entity of the MS shall: - stop all running call control timers; - send a RELEASE message; - start timer T308; and - enter the "release request" state. 5.4.4.2.1.2 Expiry of timer T306 The call control entity of the network, having entered the "disconnect indication, shall, upon expiry of timer T306, continue clearing by sending a RELEASE message with the cause number originally contained in the DISCONNECT message; starting timer T308; and entering the "release request" state.
description: Customized Calling Backup Service (CCBS) is a telecommunication service that provides backup functionality for customized calling features. It ensures continuity of services by allowing the network to manage call control and provide in-band tones or announcements when necessary, even if CCBS activation is not possible.
explanation: CCBS is classified as a Service because it refers to a specific telecommunications offering that enhances user experience through backup functionality for customized calling features. The context provided highlights its role in managing call control and providing alternative solutions during network operations.
section_title: 5.4.4.2.1 Clearing when tones/announcements provided and the network does not indicate that "CCBS activation is possible"
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