Content for TS 24.173 Word version: 18.0.0

1… 4… J… K… M…

K.1 Scope K.2 GPRS (Iu mode only) aspects when connected to the IM CN subsystem K.3 Application usage of SIP

K (Normative) IP-Connectivity Access Network specific concepts when using GPRS to access IM CN subsystem |R13| p. 26

K.1 Scope p. 26

The UE may support the present annex.

The present annex defines IP-CAN specific requirements for a multimedia telephony communication service and associated supplementary services in the IP Multimedia (IM) Core Network (CN) subsystem, where the IP-CAN is General Packet Radio Service (GPRS).

K.2 GPRS (Iu mode only) aspects when connected to the IM CN subsystem p. 26

K.2.1 Procedures at the UE p. 26

K.2.1.1 General p. 26

The UE may support any of the procedures of clause K.2.1.

K.2.1.2 Application specific Congestion control for Data Communication (ACDC) procedure p. 26

The following information is provided to the non-access stratum:

MO-MMTEL-voice-started;
MO-MMTEL-voice-ended.
MO-MMTEL-video-started; and
MO-MMTEL-video-ended;

Upon request from a user to establish an originating multimedia telephony communication session as described in clause 5.2:

if only audio or only real-time text or only both audio and real-time text (see clause 4.2 for 3GPP systems) are offered in the multimedia telephony communication session, and no other originating multimedia telephony communication session initiated with offering only audio or only real-time text or only both audio and real-time textexists, the UE sends the MO-MMTEL-voice-started indication to the non-access stratum and continue with session establishment as described in clause 5.2;
if video is offered in the multimedia telephony communication session, and no other originating multimedia telephony communication session initiated with offering video exists, the UE sends the MO-MMTEL-video-started indication to the non-access stratum and continue with session establishment as described in clause 5.2.

When an originating multimedia telephony communication session ends (i.e. a response to a BYE or a failure response to the initial INVITE request is transferred), the originating multimedia telephony communication session was initiated with offering only audio or only real-time text or only both audio and real-time text (i.e. in the SDP offer in the initial INVITE request), and no other originating multimedia telephony communication session initiated with offering only audio or only real-time text or only both audio and real-time text exists, the UE sends the MO-MMTEL-voice-ended to the non-access stratum.

When an originating multimedia telephony communication session ends (i.e. a response to a BYE or a failure response to the initial INVITE request is transferred), the originating multimedia telephony communication session was initiated with offering video (i.e. in the SDP offer in the initial INVITE request), and no other originating multimedia telephony communication session initiated with offering video exists, the UE sends the MO-MMTEL-video-ended indication to the non-access stratum.

K.3 Application usage of SIP |R14| p. 27

K.3.1 Procedures at the UE p. 27

K.3.1.1 3GPP PS data off p. 27

K.3.1.1.1 General p. 27

The requirements in clause J.3.1.1.1 apply.

K.3.1.1.2 Enforcement p. 27

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

the UE shall release according to TS 24.229 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.
the UE shall not send according to TS 24.229 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.
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 TS 24.229 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 TS 24.229 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 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 TS 24.229 and as described in clause 5.2 via non-3GPP access.
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 TS 24.229 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 TS 24.229 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 video; and
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 TS 24.229;
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 TS 24.229.
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 p. 28

K.3.2.1 3GPP PS data off p. 28

The requirements in clause J.3.2.1 apply.

L (Normative) Timers |R14| p. 29

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.