I've had that issue in the past, I can't remember what was my
configuration back then, but now I have all the SIP peers pointing to
phones use dtmfmode=rfc2833
and the adapters using DTMF_Tx_Method = Auto and the problem is gone.

Regards,
Liviu Toma


On 3/14/07, Sean Healy <[EMAIL PROTECTED]> wrote:
Hi all,

I have an SPA-2102 connected to a Nortel phone system.  I have an issue
where I'm hearing duplicate (and sometimes triplicate) DTMF tones on
both ends.  That is, duplicate from a Nortel phone or from the caller.

Both incoming and outgoing calls are going through Unlimitel.  I've
specified dtmfmode to use rfc2833 on the trunk.

Between the SPA-2102 and Asterisk, I've tried switching dtmfmode between
rfc2833 (avt), info, and inband with no luck.  Also, we're using
firmware 3.3.6 on the SPA-2102.

Any thoughts on what may be causing this?

Thanks,
Sean.

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