name: ATGW
full_form: Access Transfer Gateway
context: [TS 23.237, clause B.2.1]: After SRVCC has been successfully performed (see clauses 6.3.2.1.9.1 and 6.3.2.1.9.2), MSC Sever may initiates a SIP REINVITE to modify the Selected Codec towards the remote end in order to minimize the transcoding points in the voice path. Figure B.2-1 below illustrates this procedure with the assumption that the remote end supports the selected target RAN codec (B) in the Re-INVITE. Figure B.2.1-1: Re-negotiation method towards the remote end 1. SRVCC is performed. MSC Server has included all supported codecs into the session transfer request to the ATCF. In this flow the codec list may include the codec that is currently used in the ongoing IMS session and ATCF has selected this codec, therefore there is no transcoding in ATGW but there may be transcoding in CS-MGW. The session between UE and CS-MGW uses the codec-B. The session between CS-MGW, ATGW and remote end uses the codec-A. NOTE 1: If the codec list from MSC Server does not include the codec that
description: The Access Transfer Gateway (ATGW) is a network function responsible for facilitating access transfer and codec negotiation between different network segments, ensuring seamless communication and minimizing transcoding points in the voice path.
explanation: The context describes ATGW's role in managing codec negotiations and access transfers between various network components like MSC Server, CS-MGW, and remote ends. This functionality directly aligns with the definition of a Network Function.
section_title: 12.27a.2Conformance requirement
biotag_Context: O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O
biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O