Content for TS 24.186 Word version: 19.0.0

1… 4… 9… 9.3… 9.3.3… 9.4… 10… 10.11… A… A.1.2… A.1.2.2… A.1.3… A.1.3.2… A.1.3.3… B… C…

A.1.3.3 IMS serving the transfer target provides data channel service A.1.3.3.1 Blind Transfer A.1.3.3.2 Consultation Transfer
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A.1.3.3 IMS serving the transfer target provides data channel service p. 50

A.1.3.3.1 Blind Transfer p. 50

Copy of original 3GPP image for 3GPP TS 24.186, Fig. A.1.3.3.1-1: Blind Transfer when IMS serving the transfer target provides data channel service

Figure A.1.3.3.1-1: Blind Transfer when IMS serving the transfer target provides data channel service
(⇒ copy of original 3GPP image)

Figure A.1.3.3.1-1 shows a call flow for consultative transfer when IMS serving the transfer target provides data channel service.

Step 1.

UE-A calls UE-B, UE-A sends an INVITE request towards the UE-B.

Step 2.

UE-B answers the call, session connection is established between UE-A and UE-B.

Step 3.

UE-B starts transfer process. UE-B sends a REFER message to transfer the call to UE-C.

Step 4-5.

IMS-B sends 202/NOTIFY to UE-B to accept the transfer request, and then sends BYE message to UE-B.

Step 6.

IMS-B sends an INVITE message towards UE-C.

Step 7-9.

IMS-C forwards the INVITE message to UE-C. On reception of 18X/200 message with data channel media from UE-C, IMS-C allocates the data channel media resources on MF for UE-A and UE-C.

Step 10..

IMS-C sends the 18X/200 message to IMS-B.

Step 11-12.

IMS-B transfers the 18X/200 message to reINVITE message and sends it towards UE-A, UE-A responses 200 OK with data channel media answer to IMS-B.

Step 13-14.

IMS-B transfers the 200 OK message to PRACK/ACK message and sends it to IMS-C. IMS-C update data channel media on MF. Then IMS-C sends the PRACK/ACK message to UE-C.

Step 16.

The BDC media connections are established on MF of IMS-C for both UE-A and UE-C.

Step 17.

The ADC media connections are established between UE-A and UE-C.

Step 18.

The session connection is established between UE-A and UE-C.

A.1.3.3.2 Consultation Transfer p. 51

Copy of original 3GPP image for 3GPP TS 24.186, Fig. A.1.3.3.2-1: Consultative Transfer when IMS serving the transfer target provides data channel service

Figure A.1.3.3.2-1: Consultative Transfer when IMS serving the transfer target provides data channel service
(⇒ copy of original 3GPP image)

Figure A.1.3.3.2-1 shows a call flow for consultative transfer when IMS serving the transfer target provides data channel service.

Step 1.

UE-A calls UE-B, UE-A sends an INVITE request towards the UE-B.

Step 2.

UE-B answers the call, session connection is established between UE-A and UE-B.

Step 3-9.

UE-B holds UE-A, and then calls UE-C, session connection is established between UE-B and UE-C. IMS-C establishes BDC connection for UE-B and UE-C. And then IMS-C establishes ADC connections between UE-B and UE-C.

Step 10.

UE-B starts transfer process. UE-B sends a REFER message to transfer the call to UE-C.

Step 11-12.

IMS-B sends 202/NOTIFY to UE-B to accept the transfer request, and then sends BYE message to UE-B.

Step 13-15.

IMS-B sends a re-INVITE request to establish the connection between UE-A and UE-C.

Step 16.

IMS-C updates the DC media connection for UE-A when receiving the updated data channel media from UE-A.

Step 17-19.

The media re-negotiation finished between UE-A and UE-C.

Step 20.

The BDC media connection is established on MF of IMS-C for UE-A.

Step 21.

The ADC media connections are established between UE-A and UE-C.

Step 22.

The session connection is established between UE-A and UE-C.