We have a prolian server (IVR) which is connected on the Ethernet port of Cisco 2811 ip base router
I need to connect the E1 (PRI ISDN with 30 lines call) received from my telecom operator on that router
The router receive calls on E1 card from telecom operator then send call to the IVR prolian sever connected on Ethernet port
Please what are the requirement to achieve this application
E1 card, IOS version, ....
Yes - that's more or less it.
Each channel of voice (running G711) would require one channel of DSP to run. So if you have a 2-port VIC2-2FXS for example, you would need 2 channels of DSP. You require more for advanced/compressed codecs.
As your E1 has 30 channels, you need 30 channels of DSP. So the smallest you can use is a PVDM2-32. It's supplied in the form of a small module (like a memory DIMM) which you install internally in the router.