DTMF out-of-band on MGCP

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Jun 10th, 2009
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I would like to configure dtmf out of band for an issue I may be having on an MGCP gateway. The gateway, however, does not have dial-peers. MGCP gateways that are configured via cluster used to have dial-peers numbered in the 9XX range, I believe, but I've found that in more recent revisions that this is not the case. Does anyone know how this has changed and what recourse I have for this issue?

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shikamarunara Wed, 06/10/2009 - 09:55
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There's an MGCP command;

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

That appears to be an equivalent. Is this what it is for?

parshah Wed, 06/10/2009 - 09:59
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that command will do that trick.


harris.h Wed, 06/10/2009 - 10:24
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Hi There

This may or may not be applicable,

taken from another forum post:

CSCso87127 in-band DTMF leakage of 40-50msec observed when using DTMF relay

May be worth checking out.

Nicholas Matthews Wed, 06/10/2009 - 17:26
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In all circumstances, the gateway will send a NTFY with D/.

This command allows for it to advertise the capability to CUCM and for CUCM to know to forward it on.

If you use 'ccm-manager config' this is an automatic configuration.

You can use 'debug mgcp packet' and you should see NTFY messages with the line D/1, D/2, etc in it.



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