name: ATCF
full_form: Access Transfer Control Function
context: with the serving leg of new CS access leg. The CDF updates ATCF CDR related to the IMS session, with new serving leg, and acknowledges the reception of the data. 8. ACK from MSC server to ATCF 9. The ATCF creates and sends a SIP INVITE request via a new dialog to the SCC AS for indicating the transfer has taken place. 10. The SCC AS sends a SIP 200 OK confirmation response to the ATCF containing SDP answer stored during the original session establishment procedure. 11-13. The ATCF sends an Charging Data Request[Start] to record start of a user session/media component in the ATCF CDR for home leg of new CS access leg. 11-12a-13 Alternatively, when "OneChargingSession", the ATCF sends an Charging Data Request[Interim] to record modification of the ATCF CDR with the home leg of new CS access leg. The CDF updates ATCF CDR related to the IMS session, with new home leg, and acknowledges the reception of the data. 14. The ATCF acknowledges the SIP 200 OK. 15, 19-20 The SCC AS terminates the
description: The Access Transfer Control Function (ATCF) is a network function responsible for managing access transfer and session control in the IMS network. It interacts with other network functions such as the MSC server, CDF, and SCC AS to facilitate seamless session transfers and updates charging data records.
explanation: The context describes ATCF's responsibilities in controlling access, managing sessions, and interacting with other network elements, all of which are characteristic functions of a Network Function within a telecommunications system.
section_title: 5.2.2.1.22.3UE session transfer PS to CS using ATCF
biotag_Context: O,O,O,O,O,O,B-Mode,O,O,O,B-Network Function,O,B-Network Function,B-Message,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,O,B-Network Function,O,O,B-Network Function,O,O,B-Network Function,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,B-Network Function,B-Network Function,O,O,O,O,O,O,O,O,O,B-Network Function,B-Network Function,O,O,B-Protocol,O,O,O,O,O,O,B-Network Function,O,B-Protocol,O,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,O,O,B-Network Function,B-Message,O,O,O,O,O,B-Mode,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Network Function,B-Message,O,O,O,O,O,O,B-Mode,O,O,O,B-Network Function,O,B-Network Function,B-Message,O,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Protocol,O,O,O,O,O,B-Network Function,B-Network Function,O,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,B-Network,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,B-Network Function,B-Network Function,O,O,O,O,O,O,O,O,O,O