[asterisk-users] IAX2 trunks unreliable becoming UNREACHABLE aftera time

[Stephen Davies]

I have a network of offices using Asterisk that are connected via IAX2
> trunks. The trunks work great for a day or two then for no reason at all one
> end of the trunk will become UNREACHABLE while the other end is still
> connected. The oving nly way to fix the problem is to shutdown Asterisk
> completly then start it backup again. The end that dies is not always the
> same, some times it is server A and some times it is server B. Never have I
> seen that both ends die, just one. The side that is still connected can make
> calls to the end that died but not the other way. If you call from the
> server with the dead IAX2 trunk you here "All circuts are busy now." All
> networks have static IP addresses and their firewalls are setup to allow UDP
> 4569 to come in to the Asterisk systems.
>


We've got customers who experience this problem.  We believe it is a fault
with their NAT routers - I've traced traffic and our return packets do not
arrive at their Asterisk box.  Rebooting their NAT/ADSL routers fixes the
problem.  (Restarting their Asterisk does too - I assume the traffic from
the box causes the NAT router to re-open a mapping.

Steve
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