[Asterisk-Users] "Glare" condition - How well does asteriskhandle?

[W. Kevin Hunt]

very very sure.  pri's don't experience glare.  channelized t1's do
(they are actually CAS lines, or carrier associated signalling)

pri's use out of band signalling (the D channel,which is usually the
24th channel)
Q.921 and Q.931 handle layer 2 and 3 call setup and tear down.  Q.931
would not allow a simultaneous negotiation of both ends attempt to use a
channel.  See http://www.freesoft.org/CIE/Topics/126.htm for more info
on Q.931 or, if you have a cisco box w/ a PRI on it, do a debug isdn
q.931 to see the setup and tear down messages...

W. Kevin Hunt

CCIE #11841
www.huntbrothers.com
 
-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Paul Crick
Sent: Tuesday, May 25, 2004 7:32 PM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] "Glare" condition - How well does
asteriskhandle?

> You are correct... No glare on a PRI
Are you sure?

What about the scenario where the CO switch offers you a call at the
same time you try to set up an outbound call on the same channel?

We dealt with this at my previous company (developing with VOS/CT-ADE
and Dialogic hardware connected to PRIs) and I'm pretty sure there was
some documentation from Intel that said how to deal with it. I think
incoming calls have to take precendence, so if you try and make an
outbound call at the same time an incoming call is presented, you answer
the inbound call and give it regular incoming call treatment, then
failover your outbound call to use a different channel.

Ultimately, PRI is all about exchanging messages in the right order, so
it's totally feasible that you could get glare, no?

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