name: EATF
full_form: Emergency Access Transfer Function
context: - Generates and sends an E-STN-DR to UE for session continuity procedure toward the CS domain. The E-STN-DR is used by the EATF to correlate two access legs, and is unique for each access transfer function within an EATF. The EATF performs the session continuity when the Access Transfer request indicated by the E-STN-SR is received. [TS 23.237, clause 6c.2.1] Figure 6c.2.1-1 provides flow for SRVCC for IMS emergency session, when the IMS emergency session is active session. This applies when a single EATF instance is deployed (see clause 6c.2.3 for multiple EATF instances). Figure 6c.2.1-1: IMS level Call flow for SRVCC for IMS emergency session with E-STN-SR with a single EATF instance 1. MSC Server initiates the session transfer with the E-STN-SR and it includes the equipment identifier. 2. The I-CSCF routes the INVITE directly to the EATF via I5 by using similar procedures to that defined in TS 23.228 [4] for PSI based Application Server termination. NOTE 1: The use of indirect
description: The Emergency Access Transfer Function (EATF) is a network function responsible for performing session continuity when an access transfer request is received, specifically in the context of Single Radio Voice Call Continuity (SRVCC) handovers to the Circuit Switched (CS) domain. It generates and sends E-STN-DRs to correlate two access legs and ensure seamless transitions between different network domains.
explanation: The provided context from 3GPP TS 38.523 and TS 23.237 clearly outlines the role of EATF in managing session continuity during SRVCC handovers, making it a Network Function as per the predefined categories.
section_title: 11.5.7eCall Only mode / SRVCC Handover to CS domain / UTRAN / MSD Update / Success / 5GS
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