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

[Gordon Henderson]

On Mon, 18 Feb 2008, Stephen Davies wrote:

> 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.

Wouldn't be Drayteks by any chance?

I've since gone-off them for ADSL routers due to unexplained NAT issues... 
Shame as the traffic shaping seems to work!

Gordon