as the topic suggests, i'm having issues running a multi party video call. we haven't set up any kind of voice or integration with our pabx or anything.. this is purely IP.
when i have 2 people in an IM chat, i can click the camera button and turn it into a video call, but then i can't invite anyone. and conversely if i have 3 people in an IM chat, the camera icon is greyed out.