That's almost always due to a NAT problem. Try using a stun server to solve
this problem (stun.gist.net for example) 

->-----Original Message-----
->From: [EMAIL PROTECTED] 
->[mailto:[EMAIL PROTECTED] On Behalf Of Doug
->Sent: Thursday, September 08, 2005 11:38 AM
->To: asterisk-users@lists.digium.com
->Subject: [Asterisk-Users] Call goes through, but no audio
->
->Hi,
->
->Does someone know what the problem is when the call goes 
->through but one or both parties can't hear the other?
->
->What are the common causes?  Solutions?
->
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