One way voice problem over SIP phone installed on Mac OS X using VPN

One-way-voice problem using SIP phone on Mac OS X over VPN.  Phone works perfectly when connected locally, but user does not hear voice when connected with the VPN.  Vista PC using the same SIP phone over a VPN works fine.
Does anyone know a solution for this?  I have seen various post about this, but no resolutions.
Dennis_AtkinsAsked:
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greekstonesCommented:
Hi there

OK this is NAT issue . . Place your SIP server with a Public IP address.


regards.
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Dennis_AtkinsAuthor Commented:
Any suggestions on how to do what you are suggesting?
I tried to set the sip phone with the public ip of ourt call manager, but it was not able to establish a connection.
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Alicart IT Dept.Commented:
Check if the original IP address of the network adapter is being sent in the invite packet rather than the VPN IP address, this causes the audio to be streamed to the wrong IP and as such one way voice is experienced.
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Dennis_AtkinsAuthor Commented:
Offically gave up on this.  Ciso gave a hint that it may be a bug in there client software for the Mac OS X.  We just set up the Mac with Boot Camp and have the SIP phone running on the Vist partition.
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