asterisk users - Sep 2007 - DTMF

Hi

Ever since I upgraded to the most recent V1.2 * and Zaptel DTMF 
stopped working. If I call my cell and press a key, I can hear that 
it's trying to send a tone, but there's not enough to trigger the 
menus at the places I call.  I can't see that this is user adjustable 
and it use to work just fine.  Any suggestions on how to fix or 
troubleshoot this.  I did recently install * and Zaptel 1.4 and then 
go back to 1.2 if that matters.

Thanks ever so much,  Ira