C.36 Generic test procedure for removal IMS session release after SRVCC CS+PS Handover – 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

Test procedure:

1) SS sends BYE to UE

2A) SS waits for UE to send 200 OK

2B) SS waits for UE to send 481 Call/Transcation Does Not Exist

Expected sequence:

Step	Direction		Message	Comment
	UE	SS
1	🡨		BYE	SS sends BYE
				Exception: Based on the UE implementation, either IMS session is removed internally or will be terminated explicitly. If UE does not delete the IMS session, then, UE sends 200 OK otherwise ‘481 Call/Transcation Does Not Exist
2A	🡪		200 OK	UE sends 200 OK.
2B	🡪		SIP 481 Call/Transaction Does Not Exist	UE sends 481 Call/Transcation Does Not Exist