Making a long distance call using a remote MGCP GW possible?

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Sep 18th, 2010
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Here's my topology:



GW1: is at branch 1 and has a Local PRI circuit ONLY

GW2: is at branch 2 and has a Long Distance PRI circuit and some local PRI's

If users at branch 1 want to make long distance calls, they must use the long distance circuit at branch 2. That's what I wanted to accomplish. I can configure a voip dial-peer on GW1 to send long distance calls to GW2. Do I need to do anything extra on GW2 to make it work? Note, everything on GW2 has been working fine today.

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dksingh Sat, 09/18/2010 - 11:28
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I am assuming users ar Branch2/GW2 can make LD calls fine?

I would recommed not to point the h323 voip dialpeer on GW1 directly to GW2.

Rather point it to CUCM and ensure that GW1 CSS has access to LD route pattern

partition pointing to GW2 LD PRI.

GW2 LD PRI is MGCP controlled and you don't want to bypass CUCM by attempting

to send calls directly from GW1 over it.

Hope this helps.


ktran-anet Sat, 09/18/2010 - 11:40
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Correct, users at branch 2 can make LD calls fine. If I route LD from GW1 to CUCM, would that cause any loop because GW1 is H.323? So put it this way, a call is initiated at GW1, CUCM sends that call immediately to GW1 without looking up its dial plan because GW1 is H.323 controlled. You then tell GW1 to send it back to the CUCM, I'm not sure how CUCM can route that call out to the LD circuit at GW2? I would assume it will cause a loop by sending that call back to the H.323 GW1.

dksingh Sat, 09/18/2010 - 11:59
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What we need to clarify is which users are u talking abt at Site1/GW1 ?

IP phone users there shd be able to call LD using GW2/Site2 LD PRI

without involving GW1 as both Site1 ip phones and GW2 PRIs are registered

with CCM. For this all u need to ensure is the Site1 IP phones CSS has

LD partition that is assigned to LD route pattern (pointing to GW2/LD PRI)

Pots leg (FXS/FXO/PRI etc.) at site1/GW1 shd be using a voip dialpeer

to hit CCM for LD calls that CCM will route over to GW2/LD PRI. Configure

your CSS/partitions properly for proper call routing and avoiding a loop.


ktran-anet Sat, 09/18/2010 - 13:20
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Thanks Dilip. I'll try it tonight and will let you know how it goes.


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