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

[Storer, Darren]

Hi,

WKH> You are correct... No glare on a PRI

Really? I followed some of the regular advice that's dispensed on this list
and tried to RTFG. Interestingly it transpires that several hundred hits on
Google seem to imply that you're both wrong:

http://tinyurl.com/2vmrh

..and here are two PRI/Glare scenarios nicely documented by Intel (for their
Linux stack before someone mentions M$):

http://tinyurl.com/27her

and

http://tinyurl.com/27her

Perhaps we are disagreeing over use of terminology rather than an event that
can obviously occur. I understand why  Scott raises the issue especially
with the aggressive services that he supports using Asterisk. Perhaps Scott
could use his call loop-back stress tester code to model the problem and let
us know how Asterisk behaves in a test environment. (Although he might need
two * machines, back to back, to recreate real circuit contention problems.)

Just my 2c

Darren
--
Comgate
Telco>Internet<Broadcast

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of W. Kevin Hunt
Sent: 25 May 2004 23:27
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

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 Steven
Critchfield
Sent: Tuesday, May 25, 2004 3:26 PM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] "Glare" condition - How well does
asteriskhandle?

On Tue, 2004-05-25 at 13:53, Scott Stingel wrote:
> Hi-
>
> I have an upcoming application that requires use of PRI channels that
> are primarily used for high-volume incoming traffic, but that are to
> be used for outbound calling as well.  Of course, one option is to
> have dedicated outbound channels reserved, but this is an inefficient
> use of channel resources.
>
> Normally PBX's are designed to have the CPE yield to an incoming call
> if a particular channel is seized by both ends at the same time (a
> condition known as "glare"), but I'm wondering if anyone has
> real-world experience with asterisk to say how well this is handled.

While I may be wrong, I don't think "glare" happens on PRI. The
difference being that the call isn't sent over a channel until there had
been communications on the D channel. This means a send and a receive.
"Glare" would happen on a channelized T1 where it is possible for each
end to try and seize the channel at the same time, since there isn't any
out of band communications.
--
Steven Critchfield  <critch at basesys.com>

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