you mean VOCAL or SIPUA? They both offer VoIP but are too complicated.
I only need pc-to-pc talking and whiteboard that teachers and students can discuss on it. pc-to-phone is not needed. In fact, I want to modify VOCAL or SIPUA to suit my requirement like that :
1. as clients login(teacher or students), the user agent component is automatically downloaded. I have trouble in this part, both user agent programming and automatic download.
2. clients are all connect to one server which is responsible for registrar and talking. I’m still finding open source tools.
if anybody can give me some advice, I’ll be very appreciated.