Passing Voice from one site to another

[matt95gsr]

Hi,

I am trying to find the proper solution to tie two PBX's together using FXO/FXS ports from router to router. Basically, I have two sites with a point-to-point T1, and NEC PBX at each site. What we're wanting to do is basically create a couple of OPX extensions from the main site to the remote, coming out of the PBX as an anaolog line to an FXO port on the router, over the T1 to the other router, and then out to a trunk on the remote PBX from the FXS port on that remote router. Can anyone give any suggestions, recommendations for hardware, etc., or some sample configuration? Thanks!

Matt.

 

[kcbell]

Matt:

Without knowing what routers and model of PBX, here is my two cents.

If you are using Cisco router, please visit the Cisco web site and search for documents that talk about "gateway-pbx". I am not sure your approach is the right way to go when you have a T1 between two sites. It also depends on your PBX. Can you PBX take fractional T1 voice channels coming out from the router?

Hope this help!

 

[mmcalli]

You might want to consider using something like a pair of Adtran TSU 100's with a drop and insert configuration. You break out a certain number of channels of the point-2-point T span and connecting them to your PBX's on each end--the balance is used for the data. I've used this config with Lucent PBX's and cisco 2500's several years ago. Adtran used to have a document that covered the basic configs. Good Luck!

 

[kcbell]

mmcalli:

What you suggested is exactly what I will be implementing soon with a Cisco router. The gateway-pbx articles in Cisco web site provide configuration hints to various PBX with Cisco hardware.

 

[kcbell]

mmcalli:

I have a philosophical question: If there is no IP phones involve with this implementation, Will you call this project VoIP project? I have some discussion with my overseas counterpart with this issue. I don't call it VoIP because neither SIP nor H.323 protocol are used to communicate. What do you think?