[Asterisk-Users] premature call release - SIP 480

[Damon Estep]

> Damon Estep wrote:
> > When executing: Dial (SIP/##########@###.###.###.###,60
> > <mailto:SIP/##########@###.###.###.###,60>) I get about 15 seconds
of
> > ringing, the called party rings, but if not answered in the ~15
seconds
> > I get back SIP 480 temporarily unavailable.
> >
> >
> >
> > If the call is answered everything is fine and the call will
continue as
> > expected.
> >
> >
> >
> > The call is being passed to a TNT media gateway then to the PSTN via
a
> PRI
> >
> >
> >
> > The TNT reports Q850 cause 19 and responds with SIP 480
> >
> >
> >
> > Somehow the TNT thinks the called stopped progressing on the PRI
after
> > 15 to 20 seconds.
> >
> >
> >
> > The Telco says they have done a capture and are getting a normal
> > release, in other words their switch is not terminating the call or
> > sending any Q850 message.
> >
> >
> >
> > I can not find any timers in the TNT that might cause this, and it
is
> > not reporting any expired timers.
> >
> >
> >
> > Any ideas?
> >
> >
> >
> > Does the SIP INVITE from * to the TNT contain a timeout? If so is it
> > possible the, 60 in the dial command is being ignored?
> >
> >
> >
> > Either;
> >
> >
> >
> > The TNT got a maximum time parameter from asterisk and it has been
> > exceeded, so the TNT responds 480, or;
> >
> > The TNT has a timer that expires after n seconds and sends the 480
on
> > its own, or;
> >
> > The Telco is not seeing the progress they want to see and is sending
the
> > Q850 cause 19.
> >
> >
> >
> > Any opinions, suggestions?
> >
> >
> Do you have qualify= on ?
> 
This ended up being a global dial out timer on the media gateway (MAX
TNT) in the SYSTEM profile.