[Asterisk-Users] Freak incidents, who's to blame?

[Henry Devito]

Nortel and Toshiba and so on help eliminate this by routing outgoing calls 
starting from the highest trunk backwards and incoming calls of course start 
from the lowest trunk and work upward.
----- Original Message ----- 
From: "Ryan Courtnage" <ryan-lists at voxbox.ca>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at 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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