I get an occasional similar problem, we have Mikrotik firewalls and from tcpdump monitoring on
the asterisk boxes I can see that the firewall (unbidden) has changed the IAX port. Usually a
firewall reset and sometimes PBX reset combination fixes it.
Its odd as its only one direction, occurs rarely and with no obvious driver. So IAX is happy
in one direction but not the other. And I can see packets in the unhappy point arriving on the
wrong port.
I couldn't fix it without kicking the router/firewall so I would say its a router problem in
the Destination NAT process.
Cheers Duncan
Port is changed when NAT is applied from LAN to WAN.
While UDP session is maintained as ESTABLISHED, that port should not change.
If your peer changes constantly of session port could be UDP session
is too short in NAT table on routers.
You can try setting qualify=1000 (which is in ms. Default is 2000),
and see if peer keeps same port.
Regards.
voip-info.org also has an entry about general NAT related issues, which could
be relevant here
I do not seem to have problems with Netgear firewalls, but other firewalls show this effect. So
far it happened only on a single side, such that calls work from the other side. I already
checked the open ports with nc/ncat/netcat as UDP sender and receiver on the other end. The
ports are open, even when the arbitrary ports are used by Asterisk.
I'll need to read a bit more and evaluate my pcap traces and possibly ask the
router vendors.
Thank you for your efforts.
jg
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