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?