That's what I was thinking... after much troubleshooting, it appears some of 
the extensions I was using to test had polycom phones that was auto-forwarding 
calls to an avaya pbx.  
   
  After turning this feature off, the calls are now going through.
   
  Thanks for your help!
  :)
   
  -----Original Message-----
  From: Philip Mullis [mailto:[EMAIL PROTECTED] 
  Sent: Monday, March 31, 2008 8:36 PM
  To: [EMAIL PROTECTED]; [email protected]
  Subject: RE: [on-asterisk] Fwd: dropping incompatible voice frame
   
  looks very much like an audio codec issue, what are the settings on both 
boxes for the iax accounts? 
   
  you can do something simple like
   
  disallow=all
  allow=ulaw
   
  on each profile to lock ulaw only.
   
  ________________________________
   
  From: Scott Ivory [mailto:[EMAIL PROTECTED]
  Sent: Mon 3/31/2008 8:24 PM
  To: [email protected]
  Subject: [on-asterisk] Fwd: dropping incompatible voice frame
   
   
  correction:
   
  Has anyone come across this issue before?
     
    Mar 31 18:34:34 NOTICE[20446]: channel.c:1927 ast_read: Dropping 
incompatible voice frame on Local/[EMAIL PROTECTED],2 of format slin since our 
native format has changed to ulaw
     
    The above error message appears in the cli on asterisk box A when dialing 
7XXX from asterisk box B over an IAX2 trunk.  I can successfully receive calls 
to an extension on asterisk box B from asterisk box A using the same trunk.
     
    It happens when I try to dial an extension from asterisk box B to asterisk 
box A using:
     
    exten = _7XXX,1,Dial(iax2/asteriskboxa/${EXTEN})
     
    thanks,
    scott
   

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