Thank you David, I did an IVR on Asterisk wich reads for the caller the entered digits, it's working. I did traces for the same call on access side (where the dtmfs come with rfc2833 method) and the other interface where I send the dtmfs with sip info method to Cisco gateway. Both side seems to be OK, no duplicates.
Kind regards, Szabolcs Szasz On Mon, Mar 1, 2010 at 9:40 AM, David Backeberg <dbackeberg at gmail.com <http://lists.digium.com/mailman/listinfo/asterisk-users>> wrote: >* On Mon, Mar 1, 2010 at 9:25 AM, Szasz Szabolcs <szasz.szabolcs at gmail.com ><http://lists.digium.com/mailman/listinfo/asterisk-users>> wrote: *>>* Hi, *>>* *>>* I have encountered a DTMF issue. My scenario: *>>* *>>* Access carrier-----sip----> *>>* Asterisk-1.4.25.1-----sip---->CiscoGW-----ISDN----->TDM Switch *>>* *>>* the access carrier sends to Asterisk out of band (rfc2833) dtmf, Asterisk *>>* forwards it with SIP INFO method to Cisco gateway, but on TDM switch every *>>* digit is duplicated. Is it possible that the carrier sends inband along with *>>* rfc2833? *>* Can you take asterisk out of the loop, terminate sip carrier straight *>* into Cisco for testing? * You could also make a really simple dialplan object to do some DTMF directly with a channel on the asterisk, to see if things work properly going just that far.
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