Early Implementation By Nokia
The early Nokia implementation requires the manual setting of an attribute in the phone book. When the video session is triggered (by simply pulling down the back-side camera cover on a 6680), the video sharing client looks up the destination URI based on the MSISDN number of the B party of the current open CS voice call. The video sharing is possible only if this number has a valid entry in the phone book and a valid URI for the SIP call.
However, this method is not really scalable, since the user has to enter very complex strings into the phone book manually. Because this service does not involve any application server, it is difficult to make a good business model for it. Usually, the first commercial services were based on the idea that video sharing will increase the length of the voice sessions, and the resulting increased revenue would be enough to cover the costs of the video sharing service.
Read more about this topic: Peer-to-peer Video Sharing
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