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

[Kris Boutilier]

> -----Original Message-----
> From: Ryan Courtnage [mailto:ryan-lists at voxbox.ca]
> Sent: Tuesday, May 03, 2005 8:41 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: [Asterisk-Users] Freak incidents, who's to blame?
> 
> 
> 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.
> 
{clip}
> My questions are:  Who's to blame (telco, tdm card, * config,  
> gremlins)?  Is this avoidable?

This is a condition known as 'glare' and is expected behaviour and is actually quite common on busy lines unless a handshaking protocol of some sort is use (such as wink or ground start). Essentially this handshake signals an intent to use the trunk before it's actually seized, thereby preventing both parties from seizing it simultaneously.

Google can provide far more detail.

Kris Boutilier
Information Services Coordinator
Sunshine Coast Regional District