CIPC is working fine in all scenarios (e.g. CIPC over VPN to 7941) except:
CIPC over VPN to another CIPC over VPN call is connected but there is no audio in either direction.
Anybody have any ideas?
This is probably not a Telephony issue at all, this is most likely a VPN problem. Your VPN device may not currently be allowing ip packets to flow between the two remote endpoints. I use a VPN 3005 concentrator and I had to explicitly allow this ability in my VPN configuration before any of my VPN endpoints could make any sort of direct connection between each other.