[asterisk-users] Cisco 7960 become UNREACHABLE behind pix firewall

Alyed alyed at vivoxie.com
Sat Mar 27 19:28:23 CDT 2010


From: http://www.voip-info.org/wiki/view/Asterisk+sip+qualify
"If you turn on *qualify* in the configuration of a SIP device in
sip.conf<http://www.voip-info.org/wiki/view/Asterisk+config+sip.conf>,
Asterisk will send a SIP
OPTIONS<http://www.voip-info.org/wiki/view/SIP+method+options>command
regularly to check that the device is still online. If the device
does not answer within the configured (or default) period (in ms) Asterisk
considers the device off-line for future calls. This status can be checked
by the SIPPEER function<http://www.voip-info.org/wiki/view/Asterisk+func+sippeer>,
and inversely this function will only provide status information for peers
which have *qualify=yes*."
My guess is that your Nat/firewall is closing the connection after some time
the phone is idle, so this way Asterisk will make sure to always have
communication going trhough that connection so your NAT/firewall won't just
close it.

try playing with qualifyfreq as well.

Let us know if it helped.

Alyed



2010/3/27 James Lamanna <jlamanna at gmail.com>

> Hi,
> I have about 10 Cisco 7960s behind a PIX 506E (IOS v6.3) firewall.
> After some period of time, asterisk says that some of them are
> unreachable, and the phones lose their registration.
> The only way to make the phones recover is to clear the NAT
> translation tables for the phones on the PIX (clear xlate...)
> Does anyone know how to fix this? As you can imagine, it is quite
> annoying. And it does not happen to all the phones either.
>
> sip fixup is enabled on the PIX
>
> phone config parts:
>
> nat_enable : 1
> nat_received_processing : 0
> nat_address: [public ip of PIX]
>
> Thank you.
>
> -- James
> (Please CC me on all replies)
>
> --
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