Mike, How do I do this? (Look at the sdp?) I know how to use ngrep for SIP traffic, but not sure where to go from here? If you want to see the problem yourself, call Grandstream: (626) 638-9172 and try to navigate their IVR.. Thanks, -N On Oct 17, 2008, at 12:55 PM, Michael Jerris wrote:

It is possible you have some providers who do not support rfc2833 which is the default. You would need to look at the sdp's exchanged to know for sure.

Mike

On Oct 17, 2008, at 3:20 PM, Noah Silverman wrote:

...

Hi,

Weird situation.

I am now running my office phone through freeswitch. It works great!

Most of the companies that I call have an IVR that requires a keypress: "for sales press 1, for support press 2, etc."

With most of these calls, my key presses pass the DTMF through perfectly.

The odd part is that some of the place I call, my DTMF presses have no effect. I can hear the "tone", but the receiving party does not seem to catch it. I tried repeating the call from a landline and it DID receive my DTMF. This appears to indicate that the way I'm passing through DTMF works for MOST carriers/receivers, but not for all.

Is there something I can set in the config to ensure that the DTMF will pass through correctly in all circumstances?

Thanks,

-Noah

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