ok, so you want 100 ppl to call one “server” and listen/interact with one teacher.
VGCS is not the best way to do that.
You are right, a tech expert on PABX + looking for some voip softwares would probably do the trick.
Also, some advanced skype-like softwares, don’t you think they could offer this kind of feature ? No need to go through a dedicated pabx…
i’m not sure, just bouncing ideas around…