[Asterisk-Users] PRI Cause Code Help

[Peter Svensson]

On Thu, 17 Mar 2005, Eric Knudson wrote:

> hmm - that seems correct - I remember experiencing some similar
> problems(using Cisco IOS gateways, though) which were addressed by
> "voice call convert-discpi-to-prog"
> 
> http://tinyurl.com/5xn8n
> 
> That command addressed an IOS gateway's tendency to hang up before the
> in-band message could be played; similarly, it appears that * may not
> be providing the in-band message to playback to the calling party when
> an extension is out of service or something.

The two issues are only somewhat related. The RELEASE COMPLETE as an reply
to a SETUP after having sent a CALL PROCEEDING is probably not allowed by
the state transitions listen in q.931. 

The in-band announcement is more related to whether we have sent a
progress information element which states that in-band audio is available.  
I think Asterisk sends such a progress message almost as soon as possible.  
However, in this case the problem is a CALL PROCEEDING before the
RELEASE_COMPLETE answering teh SETUP. The fact that the CALL PROCEEDING
also includes a PROGRESS element is incidental.

Peter


> On Fri, 18 Mar 2005 00:06:24 +0100 (CET), Peter Svensson
> <psvasterisk at psv.nu> wrote:
> > On Thu, 17 Mar 2005, Eric Knudson wrote:
> > 
> > > Trevor,
> > >
> > > Nah, I think the response is correct. Take a look at the chart again:
> > >
> > > http://www.lkn.ei.tum.de/lehre/kn2/anhangKap4.pdf
> > >
> > > look at the incoming setup procedure(1 of 2) (user side).
> > >
> > > If you get an incoming SETUP, then you MUST respond with one of the following:
> > >
> > > CALL PROCEEDING, or ALERTING, or CONNECT, or RELEASE COMPLETE. Follow
> > > the rest of the logic path to completion for the rest of the call.
> > 
> > You are not allowed to first respond with a CALL PROCEEDING and then a
> > RELEASE COMPLETE. In that case DISCONNECT is allowed I think.
> > 
> > > I suspect that the carrier(since they mentioned a progress indicator)
> > > expects your equipment to cut through audio and play a message
> > > back("we're sorry, that extension is not available, blah, blah") or
> > > play a busy tone or something.
> > 
> > Peter
> > 
> >
> 

Peter
-- 
Peter Svensson      ! Pgp key available by finger, fingerprint:
<petersv at psv.nu>    ! 8A E9 20 98 C1 FF 43 E3  07 FD B9 0A 80 72 70 AF
------------------------------------------------------------------------
Remember, Luke, your source will be with you... always...