A.10 Default handling of PUBLISH requests

34.229-53GPPInternet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Part 5: Protocol conformance specification using 5G System (5GS)Release 16TSUser Equipment (UE) conformance specification

This procedure may occur within 3 seconds after a successful IMS registration.

NOTE: For sake of testability and to mitigate detrimental effect on non-IMS test cases, it is assumed that such PUBLISH request arrives at SS within 3 seconds of sending 200 OK for REGISTER.

The generic test procedure:

1 SS receives from the UE a PUBLISH request.

2 The SS responds to the PUBLISH request with a 503 Service Unavailable response carrying a Retry-after header field big enough to quench further publication traffic during test case execution.

Expected sequence

Step	Direction		Message	Comment
	UE	SS
1	🡪		PUBLISH	The UE sends a PUBLISH request (A.4.3).
2	🡨		503 Service Unavailable	The SS responds with 503 Service Unavailable (A.4.2).

Specific Message Contents

PUBLISH (Step 1)

Use the default message "PUBLISH" in Annex A.4.3 of TS 34.229-1 [2] applying conditions A1 and A5.

503 Service Unavailable (Step 2)

Use the default message “503 Service Unavailable” in Annex A.4.2 of TS 34.229-1 [2] and with the following exceptions:

Header/param	Value/remark	Rel	Reference
Retry-after			RFC 3261 [6]
period	7200
duration	Not present
comment	Not present