name: CCNR
full_form: Completion of Communications on No Reply
context: Figure .1.13.1 shows the Diameter transactions that are required between AS and CDF, which implements the CCNR service, and CDF after service execution. Figure .1.13.1: Message sequence chart for offline charging of CCNR service 1-5. The communication is initiated by UE-A by sending an SIP INVITE request. 6. UE-B answers with a 180 (Ringing) response. The 180 (Ringing) response is routed back to the terminating AS. 7-8. The terminating AS inserts a Call-Info header field in the 180 (Ringing) response. The Call-Info header field will contain the URI of the terminating AS with a "m" header field parameter set to "NR" (no reply). It further includes a "purpose" header field parameter set to "call-completion". The 180 (Ringing) response is routed back to the originating AS. 9-10. The originating AS removes the Call-Info header field, forwards the 180 (Ringing) response to UE-A and initiates IVR procedures. User A is informed that CCNR is possible. User A activates CCNR. 11-14. The
description: Completion of Communications on No Reply (CCNR) is a telecommunications service that enables the completion of communications when there is no reply from the called party. It involves specific procedures and message exchanges between network elements, such as the insertion of Call-Info header fields in SIP responses.
explanation: The text describes CCNR as a service that provides functionality to complete calls even when there's no response from the recipient. This definition aligns with the characteristics of a telecommunications service.
section_title: 5.2.2.1.13CCNR charging
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