[Asterisk-Users] Hangup Detection (revisited)

[Darrick Hartman]

A little background.  I'm integrating asterisk as the voicemail service
for an old Meridian/Norstar pbx which has an ATA-2 connected.  The ATA-2
is used to connect an analog device (such as a voice modem) to the pbx.
 In the past we've used vgetty and a voice modem with varying degrees of
success.

The problem is the ATA-2 does not provide disconnect supervision.  When
the outside caller hangs up, the line just goes silent.  No busy signal.
   If the inside analog device hangs up the call, the ATA-2 then
provides a dial tone.

Right now, we've been using silence detection in voicemail to determine
when the call ends.  This works most of the time.  On longer calls (say
more than 5 minutes), sometimes the silence detection does not function
and the call continues (with a bunch of recorded silence) until the
maximum voicemail length limit is reached.

Obviously, busy-detect is not going to work.  The current silence
threshold is set at the default 128.  The FXO module is configured with
Kewl Start signalling.  Would I get better results (or any different
results) if I switched to Loop Start?

Any other ideas?

Thanks,

Darrick
-- 
Darrick Hartman
DJH Solutions, LLC
http://www.djhsolutions.com

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Re: [Asterisk-Users] Hangup Detection (revisited)

[Philip Edelbrock]

Darrick Hartman wrote:

A little background.  I'm integrating asterisk as the voicemail service
for an old Meridian/Norstar pbx which has an ATA-2 connected.  The ATA-2
is used to connect an analog device (such as a voice modem) to the pbx.
 In the past we've used vgetty and a voice modem with varying degrees of
success.



If you haven't yet, I'd turn on busydetect in zapata.conf.  Can't hurt 
and might (although unlikely) work (I had to turn it on to make it work 
on my system).  Switching to loop-start might be worth a try, too.


For a while my VM * system wasn't doing disconnect detection, and it was 
OK.  I had trouble with the single-port cheapo cards off eBay with the 
silence thresholds, but using a TDM400P card fixed that for me.  Also 
make sure all you menus will time out and hang up.


You could try posting to the Nortel list:

http://www.tgrace.com/mailman/listinfo/nortel-list

They've been very helpful and kind to me.


Phil
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