I have a Cisco 2811 Routers installed in 15 remote locations with (2) PVDM2-16 Chips.
Each router has (1) Four Port FXO for PSTN Calls, and (1) 4-port FXS Card for FAX and Paging Connectivity.
I calculated that (2) PVDM2-16 would be plenty. (1) PVDM2-16 can support FXO/FXS Card, and the other one I calculated to support AD-HOC/Meet Me and Meeting Place Express Calls.
On-Net Calls will be IP-IP and will not require any DSP Resources.
Just need some feedback to make sure that above configuration will work fine.