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I am trying to configure a IP 6000 but am facing problems with registering the phone.  I am using a hosted PBX.  Is it possible to set the NAT IP Address without having the phone change the VIA line of the SIP request?  If I don't set the NAT IP Address, my network doesn't get any replies to outgoing SIP requests.  If I set the NAT IP Address, the contact URI points at the NAT IP and not my phones IP.  Any ideas, suggestions?

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