name: TRF
full_form: Transit and Roaming Function
context: During the loopback the TRF will set the Loopback-indication parameter identify when loopback apply. When the TRF receives SIP responses to initial or subsequent SIP requests from the terminating side, the TRF inserts in the P-Charging-Vector header field, if present, the "loopback-indication" header field parameter to the outgoing SIP response.
description: The Transit and Roaming Function (TRF) is responsible for handling transit and roaming traffic in telecommunications networks. It manages loopback indications, inserts specific header fields into SIP responses, and facilitates communication between different network elements.
explanation: The text describes the TRF's role in managing traffic flow, manipulating data within SIP responses, and interfacing with other network components, all of which are typical functions performed by a Network Function.
section_title: 4.4.3.6Loopback Indication
biotag_Context: O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,B-Protocol,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O
biotag_Description: O,B-Network Function,I-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,B-Protocol,O,O,O,O,O,O,O,O