Asterisk >> Endian >> SIP Trunks not working

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[lorsungcu]

I have a switchvox PBX behind an endian firewall that isn't working quite how I need it to.  I need to NAT 173...148 to 192.168.10.10, but whenever I configure SNAT, the pbx hangs trying to figure out it's IP (unlike asterisk, this does not allow you to edit configuration files, so no, I can't get any of them for you).  If I remove SNAT, it takes the address of the endian machine (173...145). 

I need to be able to register with a SIP trunk, and allow remote phones to register to the PBX.  Is this even possible?  Hope so, because aside from SIP not working (and whats new...), its a wonderful piece of software.