Content for TS 23.292 Word version: 18.0.0

1… 4… 5… 7… 7.2… 7.3… 7.3.2.2… 7.3.2.2.4… 7.4… 7.4.2.2… 7.4.2.2.3… 7.4.2.2.7… 7.5… 7.6… 7.6.1.2.2.6… 7.6.1.2.3… 7.6.1.2.3.5… 7.6.1.2.3.6… 7.6.2… 7.6.2.7 7.6.2.8… 7.6.2.11… 7.6.3… 7.7… 7.7.2… 7.9… 7.9.2… 7.9.2.4 7.9.2.5 8… A… G… H… H.5… H.5.3…

7.9.2.4 Addition/Removal of video media flow through redial using Gm Reference Point
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7.9.2.4 Addition/Removal of video media flow through redial using Gm Reference Point p. 109

Figure 7.9.2.4-1 describes how a video media flow is added to an ongoing speech session through redial for the ICS UE which is attached to the MSC Server enhanced for ICS 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. 7.9.2.4-1: Addition of video media flow for ICS UE via the MSC Server enhanced for ICS through redial using Gm reference point

Figure 7.9.2.4-1: Addition of video media flow for ICS UE via the MSC Server enhanced for ICS through redial using Gm reference point
(⇒ copy of original 3GPP image)

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 which has been inserted at session establishment.

Step 3-4.

The SCC AS sends 200 OK to the ICS UE A via the S-CSCF.

Step 5.

The ICS UE A sends a CS call disconnect message to the MSC server to release the existing CS access leg.

Step 6.

The MSC server sends the BYE message to the S-CSCF.

Step 7.

The S-CSCF forwards the BYE message to the SCC AS.

Step 8.

Completion of the CS access leg release procedure.

Step 9.

The ICS UE A sends a CS call setup message to the MSC server to establish a new CS access leg supporting video and speech media.

Step 10.

The MSC server sends an INVITE message to the S-CSCF.

Step 11.

The S-CSCF sends the INVITE to the SCC AS.

Step 12.

The SCC AS sends a re-INVITE message to the S-CSCF that offers the adding of the video media to the ongoing speech session to update the remote leg.

Step 13.

The S-CSCF sends the re-INVITE to UE B.

Step 14.

Completion of the session and bearer setup procedures, where upon the establishment of the multimedia connection, the MSC Server shall perform the video codec negotiation and set up the multimedia bearer based on the procedures defined in TS 29.163.

Figure 7.9.2.4-2 describes how a video media flow is added to an ongoing speech session through redial for the ICS UE which is attached to the MSC Server not enhanced for ICS 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. 7.9.2.4-2: Addition of video media flow for ICS UE via the MSC Server not enhanced for ICS through redial using Gm reference point

Figure 7.9.2.4-2: Addition of video media flow for ICS UE via the MSC Server not enhanced for ICS through redial using Gm reference point
(⇒ copy of original 3GPP image)

Step 1-5.

Steps 1-5 in Figure 7.9.2.4-2 are identical to Steps 1-5 in Figure 7.9.2.4-1.

Step 6.

The MSC server sends a REL message to the MGCF.

Step 7.

The MGCF sends a BYE message to the S-CSCF.

Step 8-10.

Steps 8-10 in Figure 7.9.2.4-2 are identical to Steps 7-9 in Figure 7.9.2.4-1.

Step 11.

The MSC server sends an IAM message to the MGCF.

Step 12.

The MGCF sends an INVITE message to the S-CSCF.

Step 13-15.

Steps 13-15 in Figure 7.9.2.4-2 are identical to Steps 11-13 in Figure 7.9.2.4-1.

Step 16.

Completion of the session and bearer setup procedures, where upon the establishment of the multimedia connection, the MGCF/IMS-MGW shall perform the procedures as specified in TS 29.163 to set up the multimedia bearer.