----- Original Message ----- From: "Ryan Courtnage" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users@lists.digium.com>
Sent: Tuesday, May 03, 2005 1:22 PM
Subject: Re: [Asterisk-Users] Freak incidents, who's to blame?
On 3-May-05, at 10:34 AM, Eric Wieling aka ManxPower wrote:
Ryan Courtnage wrote:
Hello all,
Everyone has probably experienced this at some point in the past:
You pick up your analog phone. Rather than hearing dialtone, you are connected with someone who has just called you. Neither you nor them heard a ring.
Maybe it's just me, but it seems these "freak incidents" would occur more frequently years ago, than now.
I've now experienced this a couple of times with an * system (TDM400p - quad FXO):
A SIP exten dials digits which are answered by a Zap trunk. As soon as Zap answers, the SIP extension is connected with an inbound (PSTN) caller (who was expecting to hear an IVR).
My questions are: Who's to blame (telco, tdm card, * config, gremlins)? Is this avoidable?
It's called "glare".
Thank you, I'm now walking down the right path.
From what I've read, glare is common in 2-way loopstart (kewlstart) circuits, and is impossible(?) to eliminate completely. But now I'm wondering what Nortel would tell a customer who experiences glare on their new Meridian system... they must do something to prevent glare from happening. Any ideas?
Ryan
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