[Asterisk-Users] SIP peer registration interval

[Rich Adamson]

> >>>If you're behind NAT try enabling qualify in sip.conf. Either
> >>>qualify=yes
> >>>or try a specific value, for example qualify=1000. More info on the
> >>>wiki:
> >>>
> >>>http://www.voip-info.org/tiki-index.php?page=Asterisk%20sip%20qualify
> >>
> >>As far as I understood, qualify has nothing to do with the registration 
> >>status but just checks if the peer is reachable. Actually, I am behind a 
> >>NAT but I have a firewall with a SIP ALG which does all the necessary 
> >>changes to the packets.
> >>
> > 
> > 
> > Dont know if this is related but I had the same problems
> > with sip registration of a snom 190.
> > Putting qualify=yes resolved it here.
> > I know it should be just for checking, but it will also keep
> > a state open on the firewall, so that might be the trick.
> 
> I have read in another (German) forum that qualify might be the cause 
> for the registration drop.
> Anyway, I'm behind a Cisco PIX which is completely SIP aware and does 
> all the NAT wizardry. sip debug also shows me the re-register any 45 
> secs. At one point, it just stops re-registering... very very ugly...

Somewhat off topic, but we just seen the same kind of issue with
a pix passing vpn. After some period of time, the vpn link simply
disappears. Moving the vpn box outside the pix fixed the problem.