Asterisk PBX behind NAT
March 17, 2008
I had a lot of problems with an Asterisk BPX behind NAT. Asterisk dropped all incoming calls after 20 seconds because of an unanswered packet. This is a well known problem when NATing Asterisk, but even Google does not provide any solution. This single problem drove me nuts last friday when I tried all possible settings on the firewall but nothing worked. And I was pretty sure this worked on the old firewall (but had no evidence since we did not protocol anything and I did not stop the time then, arrrg).
Today I mapped the whole Asterisk onto a single external IP and incoming calls worked well. After refining some firewall rules I have a working and secure environment now.
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