[asterisk-users] ISP down internal phones become unavailable

[Mr Shunz]

Hi all,

> I have a PRI, and when the Internet connection goes out so do my
> phones.  I suspect it is some type of DNS issue.  I do have a SIP
> trunk, and it appears that if I lose DNS to the SIP trunk, the entire
> PBX is offline.  I have no actual proof of any of this, and have not
> done any extensive testing to prove or disprove this.

well, we have various asterisk installations, ranging from 1.4.25
to (upgraded today) 1.4.33 (we don't use 1.6.X yet) and two
of them show this behaviour...
one is upgraded to 1.4.33, the other is 1.4.30, they have similar configuration
to all the other machines (which work flawlessy even when connection
is down), and the phones are the same brand/model we use everywhere,
with almost the same configuration.

I'm not sure about a DNS issue because all our customers have local
DNS/cache servers and we configure all the phones (and sip trunks
on asterisks) with ip addresses and not FQDNs just to be sure...

what we see is when the trunk goes down, i.e.
'Registration for XXXXXXX at YY.YY.YY.YY timed out, trying again (Attempt #ZZ)'
we have also 'Peer XXX is now UNREACHABLE (internal phones), even if they
are pingable/accessibile on the LAN...
>
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