I have a server running 3CX Mini Edition and it has a paging group setup with 4 extensions in it. The paging group is using SIP not multicast. The 4 extensions are Cyberdata v2 paging amplifiers, the phone being used to call the paging group is a Aastra 6755i. When I call the paging group the Cyberdata units beep indicating that they received a call but then they dont play the call audio over the speakers. If I just call a single extension they work fine. Does anyone have any idea's why they would work OK when calling a single extension and not the paging group? When I only had 2 of the extensions added it was working but now I've added all 4 extensions I'm getting nothing even if I remove the other extensions again.