name: CW
full_form: Continuous wave
context: Figure 5.2.2.1.8.1 shows the Diameter transactions that are required between AS, which implements the CW service and CDF for the callee (subscriber of CW). Figure 5.2.2.1.8.1: Message sequence chart for offline charging of CW service 1-2. The communication is initiated by UE-A by sending an SIP INVITE request. The Request URI includes the URI of UE-B. After IFC evaluation in the S-CSCF the SIP INVITE request is routed to the CW AS. 2a. The AS detects the CW condition and inserts a CW indication into the SIP INVITE request per procedures. 3-4. The SIP INVITE is routed to UE-B. 5. UE-B recognizes the CW indication per procedures. 6. UE-B sends back a 180 (Ringing) response. 6a. Out of scope: user B uses the HOLD service or releases a session in order to free resources. 7-8. The SIP 180 (Ringing) response is routed back to the AS. 8a. The AS optionally inserts a Alert-Info with a 'CW' URN into the 180 (Ringing) response. 9-10.The SIP 180 (Ringing) response is routed back to the
description: The Continuous Wave (CW) service enables communication waiting, allowing users to place calls and wait for the callee to become available. It involves procedures and signaling between network elements like the CW Application Server (AS) to manage the CW condition and alert the caller.
explanation: The context describes the CW service's functionality in enabling a specific user experience (communication waiting) and its reliance on network interactions and signaling, classifying it as a Service.
section_title: 5.2.2.1.8Communication Waiting (CW) charging
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