Content for TS 24.186 Word version: 18.0.0

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.1.3.2 IMS serving the transferor provides data channel service A.1.3.2.1 Blind Transfer A.1.3.2.2 Consultation Transfer
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A.1.3.2 IMS serving the transferor provides data channel service p. 44

A.1.3.2.1 Blind Transfer p. 44

Copy of original 3GPP image for 3GPP TS 24.186, Fig. A.1.3.2.1-1: Blind Transfer when IMS serving the transferor provides data channel service

Figure A.1.3.2.1-1: Blind Transfer when IMS serving the transferor provides data channel service
(⇒ copy of original 3GPP image)

Figure A.1.3.2.1-1 shows a call flow for blind transfer when IMS serving the transferor provides data channel service.

Step 1.

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

Step 2.

DC media resource is allocated by IMS-B for UE-A and UE-B.

Step 3-6.

UE-B answers the call, session connection is established between UE-A and UE-B. IMS-B establishes BDC connection for UE-A and UE-B. And then IMS-B establishes ADC connections between UE-A and UE-B.

Step 7.

UE-B starts transfer process.

Step 8.

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

Step 9-10.

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

Step 11.

IMS-B releases all the allocated data channel media resources on MF/MRF for UE-A, UE-B.

Step 12-17.

IMS-B sends an INVITE message to UE-C, the audio along with data channel media connections are established between UE-A and UE-C, the data channel media can be provided either by IMS-A or IMS-C or both.

A.1.3.2.2 Consultation Transfer p. 45

Copy of original 3GPP image for 3GPP TS 24.186, Fig. A.1.3.2.2-1: Consultative Transfer when IMS serving the transferor provides data channel service

Figure A.1.3.2.2-1: Consultative Transfer when IMS serving the transferor provides data channel service
(⇒ copy of original 3GPP image)

Figure A.1.3.2.2-1 shows a call flow for consultative transfer when IMS serving the transferor provides data channel service.

Step 1.

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

Step 2.

DC media resource is allocated by IMS-B for UE-A and UE-B.

Step 3-6.

UE-B answers the call, session connection is established between UE-A and UE-B. IMS-B establishes BDC connection for UE-A and UE-B. And then IMS-B establishes ADC connections between UE-A and UE-B.

Step 7-8.

UE-B holds UE-A, and then calls UE-C.

Step 9.

When UE-C sends 180 ringing or 200 response, UE-B starts transfer process.

Step 10.

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.

IMS-B releases all the allocated data channel media resources on MF/MRF for UE-A, UE-B and UE-C.

Step 14-18.

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

Step 19.

The audio along with data channel media connections are established between UE-A and UE-C, the data channel media can be provided either by IMS-A or IMS-C or both.