name: SIP
full_form: Session Initiation Protocol
context: added in the SIP REGISTER request. 9.-16. SIP 200 (OK) response (S-CSCF-hA1 to UE-A). The S-CSCF-hA1 acknowledges the SIP REGISTER request by means of a SIP 200 (OK) response as described in clause 5.2.2. also no specific charging events appear beyond that described in clause 5.2.2. 17. SIP REGISTER request (S-CSCF-hA1 to SCC AS-hA1) The S-CSCF-hA1 checks the iFC triggers and detects that the SCC AS-hA1 is interested in registrations from this user. The S-CSCF-hA1 sends a 3rd party SIP REGISTER request to the SCC AS-hA1. The S-CSCF-hA1 includes in the 3rd party SIP REGISTER request the contents of the initial SIP REGISTER request and the SIP 200 (OK) response to the initial SIP REGISTER request in "sip" message bodies. More detail about the message content is given in TR 29.949 [217]. 18. SIP 200 (OK) response (SCC AS-hA1 to S-CSCF-hA1). The SCC AS-hA1 acknowledges the SIP REGISTER request by means of a SIP 200 (OK) response. There is no specific SRVCC access transfer information
description: Session Initiation Protocol (SIP) is a protocol used for initiating, maintaining, and terminating real-time communication sessions over IP networks. It is widely used in telecommunications for managing voice, video, and messaging services.
explanation: The text explicitly states that SIP is a protocol used for communication over IP networks, making it a clear example of a telecommunications protocol.
section_title: 5.11.2PS to CS SRVCC information transfer during registration
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