When I connect to a videoconference and share my screen (from a GVC3200 grandstream) the other participants see only a gray screen. any ideas?
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I looked up the specs on that device, and it seems to support SIP and H.323 technology. Have you tried the GoToMeeting InRoom setup with this device?
The reason I mention this is, GoToMeeting was build for simple plug-and-play webcams, so your device will likely be too complex for this general integration.