A.14 IMS MT SMS / 5GS

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

Expected sequence

Step	Direction		Message/Procedure	Comment
	UE	SS
1	<-		SIP MESSAGE	SS sends a SIP MESSAGE request including a vnd.3gpp.sms payload that contains a short message
2	->		200 OK	UE responds with 200 OK
3	->		SIP MESSAGE	UE sends a SIP MESSAGE request including a vnd.3gpp.sms payload that contains a delivery report
4	<-		202 Accepted	The SS responds with 202 Accepted

Specific message contents:

SIP MESSAGE (Step 1)

Use the default “MESSAGE for status report for MO SMS” in Annex A.7.1 of TS 34.229-1 [2].

200 OK (Step 2)

Use the default message “200 OK for requests other than REGISTER or SUBSCRIBE” in Annex A.3.1 of TS 34.229-1 [2] with conditions A22.

SIP MESSAGE (Step 3)

Use the default “MESSAGE for delivery report for MT SMS” in Annex A.7.2 of TS 34.229-1 [2].

202 Accepted (Step 4)

Use the default “202 Accepted” in Annex A.3.3 of TS 34.229-1 [2].