[Asterisk-Users] DTMF issue on IVR

[larry lin]

Hi All,

  I encountered a DTMF problem. We have an IVR built on Asterisk 1.0.7 with 
RedHat 9. When the caller calls into our IVR, and IVR plays the first prompt 
and asks caller to dial four-digit extension. Caller has to dial slowly, 
otherwise, Asterisk cannot recognize the extension number. I look at the 
trace on Asterisk CLI and there are missing digit in the middle of string. 
ex, caller dials 3114, I can see 314 or 34 on CLI. I think the Asterisk 
barge-in response is vary slow, it usually takes half a second or so for the 
voice prompt to stop after the first key is hit. If a second key is hit when 
the prompt is still playing, this key will be missed and will not feed into 
the Asterisk IVR. However, Asterisk will be able to recognize all the keys 
if you wait long enough between the 1st key and 2nd key (and you can hit as 
fast as you can between 2nd, 3rd & 4th key).
   I searched the wiki and did not find any related information. Is there a 
way to set the barge-in response time or how many keys you can buffer before 
the prompt is stopped ?

   Please advise,

  Thanks and Regards,

Larry