[Asterisk-Users] IAX: Auto-congesting call due to slow response

[Noah Miller]

Hi Domenico -

> I have a IAX2 trunk between two sites (connected with an high bandwidth
> link) but sometime/often I get:
>  chan_iax2.c: Auto-congesting call due to slow response
> and call is dropped (and routed on a PSTN link).
> In iax.conf, I have:
>  [iax-out]
>  username=iax-in
>  type=peer
>  trunk=yes
>  secret=xxxxxxxxxxx
>  qualify=yes
>  host=xxx.yyy.zzz.32
>  auth=md5
>
> Any idea? Perpaphs is due to 'qualify=yes'...

Yes.  That's correct.  That message is what is given when when the IAX
peer fails to qualify.  For whatever reason, one box is not able to
reach the other for a short time.  Qualify=yes will give you a default
value in milliseconds (something like 500).  If the peer doesn't
respond within that time, you get the error message.   It may just be
temporary network hiccups, or one box may be very slow to respond due
to high traffic.   You can try increasing the qualify value like:
qualify=1000.

Otherwise, if you don't have any backup routes planned in your
dialplan, you can just remove the qualify statement.  Then it will
just try the IAX link no matter what.

- Noah