Hello all, I'm looking to implement the following scenario: Step 1 SIP Server A sends INVITE to port 5060 over IPv6 to FreeSwitch: 2001::1 --udp/tcp--> 2001::2:5060 Step 2 FreeSwitch SIP NATs the INVITE and sends it out IPv4 to SIP Server B on port 6000 1.1.1.1 --udp/tcp--> 1.1.1.2:6000 Step 3 All SIP Server B responses within this SIP dialog are sent back to SIP Server A along the same path. REGISTER messages WILL NOT be processed by FreeSwitch. They are handle elsewhere. There is more to this but I want to accomplish this first call flow go from there. Is this possible with FreeSwitch? Can someone point me toward a resource on how to get this created? The following looks like a good start but it seems it's setup for users to register. I would prefer not to have this. http://wiki.freeswitch.org/wiki/SBC_Setup Thanks! Joe