[Freeswitch-users] Distributing SIP registrations using ODBC

Hi Guys, I have a cluster of FS boxes all sharing SIP registrations using ODBC and under certain circumstances I can register Client-A on FS-A and Client-B on FS-B and make calls between Client-A and Client-B without issue as the relevant FS box knows how to get a call to the client from the shared registrations table. However when the callee client is behind NAT (or using a SIP client configured to only allow calls from a server it has registered with) the call gets dropped by the NAT router (or client) I can fix this easily with some LUA but before I do I wanted to check if there was an advisable or recognised FreeSWITCH way to work around this. Has anyone else solved this issue already? Regards, Dan