K.3 Application usage of SIP

24.1733GPPIMS Multimedia telephony communication service and supplementary servicesRelease 18Stage 3TS

K.3.1 Procedures at the UE

K.3.1.1 3GPP PS data off

K.3.1.1.1 General

The requirements in clause J.3.1.1.1 apply.

K.3.1.1.2 Enforcement

If the 3GPP PS data off status is "active":

a) the UE shall release according to 3GPP TS 24.229 [13] any multimedia telephony communication session as described in clause 5.2, which is not an IMS emergency call, established with a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer, and with media streams:

1) other than only audio;

2) other than only real-time text;

3) other than only audio and real-time text; and

4) not including video;

NOTE 1: When the 3GPP PS data off status is "active", an MMTEL session which is not MMTEL voice and which is not MMTEL video (e.g. MMTEL session with only fax) is released.

b) the UE shall not send according to 3GPP TS 24.229 [13] a SIP message related to a multimedia telephony communication session as described in clause 5.2, which is not an IMS emergency call, from a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer and with:

1) an SDP offer; or

2) an SDP answer;

with media streams:

1) other than only audio;

2) other than only real-time text;

3) other than only audio and real-time text; and

4) not including video;

NOTE 2: When the 3GPP PS data off status is "active", an MMTEL session which is not MMTEL voice and which is not MMTEL video (e.g. MMTEL session with only fax) cannot be initiated.

c) if the UE is not configured with indication that MMTEL voice is a 3GPP PS data off exempt service:

1) the UE shall release according to 3GPP TS 24.229 [13] any multimedia telephony communication session as described in clause 5.2, which is not an IMS emergency call, established with a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer, and with only audio, only real-time text or only audio and real-time text; and

2) the UE shall not send according to 3GPP TS 24.229 [13] a SIP message related to a multimedia telephony communication session as described in clause 5.2, which is not an IMS emergency call, from a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer and with:

A) an SDP offer; or

B) an SDP answer;

with only audio, only real-time text or only audio and real-time text;

NOTE 3: If the UE doesn’t send an intitial SIP INVITE due to conditions as described in bullet c.2, the UE can attempt a request for a service equivalent to MMTel voice via the CS domain – if supported and available – and, otherwise, the UE can attempt the service according to 3GPP TS 24.229 [13] and as described in clause 5.2 via non-3GPP access.

d) if the UE is not configured with indication that MMTEL video is a 3GPP PS data off exempt service:

1) the UE shall release according to 3GPP TS 24.229 [13] any multimedia telephony communication session as described in clause 5.2, which is not an IMS emergency call, established with a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer, and with video;

2) the UE shall not send according to 3GPP TS 24.229 [13] a SIP message related to a multimedia telephony communication session as described in clause 5.2, which is not an IMS emergency call, from a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer and with:

A) an SDP offer; or

B) an SDP answer;

with video; and

e) if the UE is not configured with indication that MMTEL voice is a 3GPP PS data off exempt service and the UE is not configured with indication that MMTEL video is a 3GPP PS data off exempt service:

1) the UE shall de-register the binding of a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer from IM CN subsystem according to 3GPP TS 24.229 [13];

2) the UE shall re-register the binding of a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer with IM CN subsystem with a Contact header field without the g.3gpp.icsi-ref media feature tag; or

3) the UE shall re-register the binding of a UE’s contact address containing an IP address associated with a GPRS IP-CAN bearer with IM CN subsystem with a Contact header field with the g.3gpp.icsi-ref media feature tag not including the urn:urn-7:3gpp-service.ims.icsi.mmtel ICSI according to 3GPP TS 24.229 [13].

NOTE 4: Which of the bullets 1), 2), and 3) the UE performs is influenced by other 3GPP PS data off exempt services.

K.3.2 Procedures at the multimedia telephony application server

K.3.2.1 3GPP PS data off

The requirements in clause J.3.2.1 apply.

Annex L (normative):
Timers

Table L.1 provides a description of the timers specified in the present document.

Table L.1: Timers

Timer	Timer value	Cause of start	Normal stop	On expiry
RequestTimeout	Configurable value between 5 seconds and 15 seconds	On sending of an initial INVITE request	On receipt of any SIP response	UE shall abort the current session attempt. If an alternative radio access network is available, the UE shall attempt the session on the alternative radio access network.

Annex M (normative):
IP-Connectivity Access Network specific concepts when using 5GS to access IM CN subsystem