provided by Star2Billing S.L.

Dear friends,
We are using call-back.
The system calls back and asks to enter distention number, but sometimes I got following numbers:
16055553477772...
So some digits entered few times.
May be some of you facing this problem before and may give me a way to put threshold for DTMF recognition.
Thank you

You can play a bit with the asterisk option "dtmfmode" in the sip.conf file.

I had a bit problems with these things with some countries. I guess the right config depends to your provider as well.

At the moment I have good results with:

dtmfmode=info
relaxdtmf=no
echocancel=yes

Default for dtmfmode ist auto, which is never a good idea!
relaxdtmf is also an good option to play with.

For other options see here: http://www.voip-info.org/wiki/view/Aste ... p+dtmfmode

Hope that helps!

Thank you for replay,
I tried info, unfortunatly the same result - some times few digits.
I do not think echo cancelation and relaxdtmf may do somthing. Info mode is out of band, so it comes to asterisk as a SIP command, not an RTP. Actualy the problem in GSM gateway, I think. I use porthech MV-374. It is chip solution, but unfortunatly not best one.