[SR-Users] Kamailio + RTPEngine SIP Proxy...

Hey there In my efforts to get a full SIP Proxy going, I have found this: https://fossies.org/linux/kamailio/misc/examples/kamailio/nathelper.cfg One very nice thing about this config, it explains a LOT. The good news it, the phones can register, subscribe, send OPTION keepalives and invites without and issues - audio works as well. BLFs, Parking Lots, etc, all good as the phone initiates the dialogs.... The bad news, I need OPTIONS keepalives and INVITES to go out to the phone. They are being send directly, from the FreeSWITCH PBX, to the externally visible IP address of the firewall which the phones are behind. This, of course won't work as the firewall is expecting the packets to come from the Kamailio ip:port and not the FreeSWITCH system. It seems, I need to tell FreeSWITCH to send all messages, for the given device, to the Kamailio Proxy but how? So, can anyone guide me at what I need to change please??? Jerry