Hey Everyone,
Ok, so I think I got everything working. It was the voip-sip plugin that was
causing the problem. I had to disable it altogether and then reboot the
astlinux box. Restarting only the firewall/iptables had no affect. It seems
like the plugin is broken, because if enabled, it will apparently do some
stateful packet inspection on all ports and modify the contents of any sip
packets it sees, not just the packets destined for the ports defined in the
plugin itself. And I guess restarting the firewall won't unload any plugins
loaded at boot?
In any case, once I disabled and rebooted, I was finally able to send a fax
to the machine behind the ATA. Looking at a packet capture shows no evidence
of modified sip messages. I'm at work so I haven't had a chance to test
outbound faxes, but I'm hoping that will work as well...
So even though I (hopefully) have it fixed, it's still very perplexing about
why it was broken in the first place. First, why was the plugin going above
and beyond the call of duty. Secondly, even if it was doing this on other
ports, why would it set the RTP information to invalid IPs?
Thanks again for the help Phillip and Lonnie!
-James
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