[Asterisk-Users] Zhone + Digium T1 bug (?)

[Steve Radich]

I've noticed what you say but I don't think that's all of the problem,
although it may well be related.

If a caller calls in, stays on a while then hangs up Asterisk / Zhone / t1
card handles it fine.  
However if a caller hangs up immediately the system never recognizes it and
we get a voice mail of "if you'd like to make a call please hang up and try
again".  When I say immediately I mean before Asterisk answers the actual
call.

Lets say I call our office, as the caller I get a ring. On the Asterisk side
I get "Starting simple switch on 'Zap/2-1'".  However it's roughly 5 seconds
until Asterisk picks up the line.  If the caller hangs up bteween this
Starting simple switch and the Zhone actually answering the call then the
hangup is never detected - instead if we transfer immediately to a phone we
have an incoming call which is a dial tone, then goes to if you'd like to
make a call please hang up and try again.. 

Steve Radich
BitShop, Inc.


-----Original Message-----
From: steve [mailto:steve at szmidt.org]
Sent: Saturday, April 26, 2003 2:01 AM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Zhone + Digium T1 bug (?)


On Friday 25 April 2003 20:25, Steve Radich wrote:
> We were just testing forwarding one of our numbers to a VoIP CLEC
> and ran into an issue that we've seen before but never figured
> out the cause of.
>
>
>
> It seems if you call us and immediately hang up - or if the call
> is forwarded by Verizon (which stills rings about ½ of one time)
> the Zhone detects the ring and answers the call.. The Zhone
> however DOESN"T detect that it's no longer ringing nor that the
> user hung up.

This is due to your TELCO taking long time to signal the hangup. 
Here Verizon takes 18 seconds before they reverse polarity.

If you have a phone with lights in it, connect it directly to your 
line. Have someone call you and start timing when they hang up. 
You'll notice so many sec's later that it blinks. That's the hangup 
signal.
-- 

Steve Szmidt
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