[asterisk-users] DTMF DIGIT PROBLEM

[Bhrugu Mehta]

hi, all
I have problem to sense digit in my ivrs.
scenario is below:

I am using zaptel T410P digium card to competible with my PSTN(CORAL)
[ivrs]
exten => s,1,Background(welcome-ivrs)

exten => 1,1,Playback(welcome)
exten => 2,1,Playback(goodby)

sound file are .wav files.
when i dial no. from analog phone to launch ivrs welcome-ivrs.wav file plays and
when i press digit 1 play wecome and 2 play goodby.
but some time asterisk server doesn't sense which digit i pressed so
welcome-ivrs file continue with playing. Doesn't stop playing

thnks, regard
Bhrugu Mehta(SIS)