[asterisk-users] SIP Extensions and loss of Internet connection

[Alejandro Imass]

On Mon, Nov 22, 2010 at 11:44 AM, Daniel Bareiro <daniel-listas at gmx.net> wrote:
> Hi, Alejandro.
>
>> > A few days I have problems connecting to the Internet on my house
[...]
> It would appear that the server for some reason was 'locked'. For
> example, when I try to register from Twinkle softphone, I get the
> following:
>
> -----------------------------------------------------------------
> lun 13:41:56
> Daniel, registration failed: 503 Service Unavailable
> -----------------------------------------------------------------
>
>

I have had a similar problem when we have some sort of network
disruption, but it _never_ affects clients on the LAN, it only affects
my SIP registrations on the public network. I have 2 NICs one on the
public network with a public IP (but dynamic), and one on the LAN. I
also have a cron to a dyndns service that updates the name of  this
server so other PBX can register to it.

Anyway, sometimes, but very rare, something happens and the is no way
that it re-registers to external SIP sources, and no other external
SIP can register with it either. Nothing works except to reboot the
server a-la Windoze. I have Asterisk 1.6 on FreeBSD 8. I have always
attributed this problem to my set-up or a quirky NIC but maybe it's
related to your problem (although it has _never_ happened to us in the
LAN extensions). Unable to find a solution, and since it's really very
rare, we have test calls every day to make sure everything is working
;-)

Best,
Alejandro Imass