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".
http://home.intekom.com/scotland/cookbook/146.htm
http://www.authorizedcom.com/lines_trunks.asp
http://www.beagle-ears.com/lars/engineer/telecom/bizphone.htm
http://www.zvon.org/tmRFC/RFC3064/Output/chapter4.html
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