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Content for  TS 23.292  Word version:  18.0.0

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7.9.2 Addition/Removal of video media flow for ICS UE  7.9.2.1 Overview  7.9.2.2 Addition/Removal of video media flow through SCUDIF using Gm Reference Point  7.9.2.3 Addition/Removal of video media flow through SCUDIF using I1 Reference Point 
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7.9.2  Addition/Removal of video media flow for ICS UE  p. 108

7.9.2.1  Overview  p. 108

The procedures in this clause and the following clauses are applicable only to 3GPP systems.
For the IMS sessions that use CS media established by the ICS UE, adding/removing of video media flow can be made by updating the CS access leg through SCUDIF procedures as specified in TS 23.172, or by using redial mechanism over the CS access leg as defined in TR 23.903 if SCUDIF is not supported.
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7.9.2.2  Addition/Removal of video media flow through SCUDIF using Gm Reference Point  p. 108

Figure 7.9.2.2-1 describes how a video media flow is added to an ongoing speech session through SCUDIF for the ICS UE over the Gm reference point. Change from multimedia (i.e. speech and video) to speech can be achieved in a similar way.
Copy of original 3GPP image for 3GPP TS 23.292, Fig. 7.9.2.2-1: Addition of video media flow for ICS UE through SCUDIF using Gm reference point
Figure 7.9.2.2-1: Addition of video media flow for ICS UE through SCUDIF using Gm reference point
(⇒ copy of original 3GPP image)
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Step 1.
The ICS UE A sends a re-INVITE message that offers the adding of the video media to the ongoing speech session to the S-CSCF.
Step 2.
The S-CSCF sends the re-INVITE message to the SCC AS.
Step 3.
The SCC AS sends a 200 OK message to the S-CSCF.
Step 4.
The S-CSCF forwards the 200 OK to the ICS UE A.
Step 5.
Completion of service change from speech to video call as specified in clause 7.9.1.2 if the ICS UE is attached to the MSC Server enhanced for ICS, or as specified in clause 7.9.1.3 if the ICS UE is attached to the MSC Server not enhanced for ICS.
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7.9.2.3  Addition/Removal of video media flow through SCUDIF using I1 Reference Point  p. 109

Figure 7.9.2.3-1 describes how a video media flow is added to an ongoing speech session through SCUDIF for the ICS UE over the I1 reference point. Change from multimedia (i.e. speech and video) to speech can be achieved in a similar way.
Copy of original 3GPP image for 3GPP TS 23.292, Fig. 7.9.2.3-1: Addition of video media flow for ICS UE through SCUDIF using I1 reference point
Figure 7.9.2.3-1: Addition of video media flow for ICS UE through SCUDIF using I1 reference point
(⇒ copy of original 3GPP image)
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Step 1.
The ICS UE A sends a Call MODIFY message to the SCC AS requesting service change from speech to multimedia (i.e. video and voice).
Step 2.
The SCC AS sends a Call MODIFY Response message to the ICS UE A.
Step 3.
Completion of service change from speech to video call as specified in clause 7.9.1.2 if the ICS UE is attached to the MSC Server enhanced for ICS, or as specified in clause 7.9.1.3 if the ICS UE is attached to the MSC Server not enhanced for ICS.
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