Modem over ATA 186 problem

Unanswered Question
Dec 20th, 2007
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Currently unable to dial out to an external (non IPT platform) modem via our ATA 186.

We are currently running CUCM V 6.0 over an MGCP Gateway running IOS 12.4(16).

Modem is trying to negotiate but fails due to numerous connection errors - Modem has not answered at far end etc.

Any ideas.

Below is MGCP print.

mgcp dtmf-relay voip codec all mode out-of-band

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp package-capability rtp-package

mgcp package-capability sst-package

mgcp package-capability pre-package

no mgcp package-capability res-package

no mgcp package-capability fxr-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp rtp payload-type g726r16 static


mgcp profile default


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Brandon Buffin Thu, 12/20/2007 - 08:24
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Modems are not supported on ATAs. That doesn't mean that they won't work, but they're not supported. You could try lowering the speed to 9600.



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