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1                                                Core network aspects


            13)-14)   MUE1 shares video via RTP or share image via MSRP with MUE2; the sharing is unidirectional.

            15)-18)   When the transfer is completed, MUE1 sends the SIP bye message to MUE2.
            19)-22)   MUE2 responds with a SIP OK message to MUE1.
            9.2.2   Content sharing without a voice call

            During the sharing without a voice call, when a MUE is connected simultaneously to multiple access networks
            and using the content sharing service, the MUE can use one connection to send and receive IP flows. Because
            of the changes in the access network, sometimes the MUE needs to transfer the IP flow from one access
            network to another, while the service itself is not affected. The information flow is shown as Figure 9-4.






















































                                Figure 9-4 – Content sharing flow transfer without a voice call
            0)      MUE1  is  connected  simultaneously to multiple access  networks and  the  MUE  can  use  multiple
                    connections to send and receive IP flows.
            1)-3)   MUE1_IF(1) initiates the SIP invite process.

            4)-6)   MUE2 successively responds with a SIP OK message.
            7)-9)   After the SIP OK message is received, the MUE1 transmits the ACK confirmation to the MUE2. By
                    this time, the SIP invite process is completed.

            10)-11)  MUE1_IF(1) shares video via RTP or shares image via MSRP with MUE2; the sharing is unidirectional.
            12)     MUE1_IF(1)'s connection is lost.


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