Legacy PBX to Legacy PBX over IP

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Aug 14th, 2008
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I would like to put together a solution to eliminate our T1 circuits used just for voice and consolidate to our IP network. I have tried Circuit Emulation cards and have not been happy with the results (mainly echo problems). I am interested in trying to set up two routers as voice gateways between the two PBXs. From the Cisco docs I have read, using a VWIC-2MFT-T1 I should be able to configure it as an E&M tie line and then transfer it across the IP network. Do I also need PVDSPs? Has anyone done this and have any recommendations. The two PBXs are connected with tie lines now using service provider T1s.

Much abliged,


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Rob Huffman Sat, 08/16/2008 - 07:59
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Hi Lorn,

We do use 2811's with the VWIC2-2MFT-T1/E1 quite nicely (not for your exact setup but I don't see any problems :) you will require DSP Resources, PVDM2-32 (for 1 T1) or PVDM2-64 (for 2 T1's)

From this good doc;


Hope this helps!



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