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Can I use SIP outbound proxy to bypass NAT?

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Do you manage the server/appliance that is the FXOGateway? What is this FXOGateway - Adtran, Asterisk w/ FXO cards, etc.?

There are quite a few options here but a VPN might be the simplest especially with regards to SIP and NAT.

Feel free to take this offline if the details get too specific and you want to send me a PM. We can always post the overall solution later in case anyone else has a similar question.