Service Description
The basic steps involved in setting up and tearing down a Video Share session are as follows:
- Circuit Switch Call Setup
- Capability Query
- Invitation Procedure
- Video Transmission
- Teardown of Video Session
- Teardown of Circuit Switch Call
The Video Share session begins with Circuit Switch call between User A and User B. The next step is the Capability Exchange in which the other handset is queried to determine if the recipient is capable of supporting a Video Share session. This is performed with the SIP OPTIONS method. Both handsets can perform this capability exchange. The Video Share session is initiated by sending a SIP INVITE message to the called party.
After the Video Share session has been set up, transmission of the actual video can begin. Video is sent between Video Share clients using RTP (Real-Time Transport Protocol), which is widely used in internet and mobile communities for video streaming. The video transport is augmented by a control protocol (RTCP) to allow monitoring of the data delivery using RTCP RR (Receiver Report) and RTCP SR (Sender Report) packets. When either party decides to stop the Video Share session, the session will be torn down (using RTCP BYE) and the SIP session stopped (using SIP BYE). After these steps the Circuit Switch voice call session still exists.
In the case of a Web Portal based Video Share session, the video is streamed to the Portal instead of User B, and accessed using a PC with a web browser.
Read more about this topic: Video Share
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