How to setup Asterisk/FreePBX behind NAT

This HOWTO assumes that your FreePBX system is sitting behind a NATed firewall with no direct connection to the outside world and it is NOT in the DMZ zone. If you have your system facing outside, or have used Mapped IP addresses or other techniques, then it is assumed that you have adequate knowledge to interpret these instructions and also assure that you have properly secured your installation.

The three key considerations in setting up remote extensions are:

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