Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

DTMF out-of-band on MGCP

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?

New Member

Re: DTMF out-of-band on MGCP

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?

Cisco Employee

Re: DTMF out-of-band on MGCP


that command will do that trick.


New Member

Re: DTMF out-of-band on MGCP

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.

Re: DTMF out-of-band on MGCP

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.