C.32 Generic test procedure for MO release of IMS call – EPS

34.229-13GPPInternet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Part 1: Protocol conformance specificationRelease 16TSUser Equipment (UE) conformance specification

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

The generic test procedure:

SS makes the UE release the IMS call. SS sends AT command CHCCS [123].

2) Call is released on the UE. SS waits the UE to send a BYE request.

3) SS responds to the BYE request with valid 200 OK response.

4)-5) Deactivation of a dedicated EPS Bearer during call establishment.

Steps 4 and 5 are applicable for a UE with E-UTRA support (TS 34.229-2 A.18/1) only.

Expected sequence

Step	Direction		Message/Procedure	Comment
	UE	SS
1				Make the UE release the IMS call
2	🡪		BYE	The UE releases the call with BYE
3	🡨		200 OK	The SS sends 200 OK for BYE
4-5				EPS Bearer Deactivation procedure according TS 36.508 [94] subclause 4.5A.15.

Specific message contents

None.