asterisk users - Jan 2004 - DTMF tone stops working with IAX (voicepulse)???

Hello all, I am using voicepulse DID's to receive calls via IAX to and
asterisk IVR dial plan I have put together. The problem is after 3-5mins the
system cant pickup the DTMF tones I am sending... I have tried different
telephones... It just repeats menu options over and over.... I have to call back
and then it works again for another few mins...

Any ideas... iax.conf? issue?

Thanks,
J.C.
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