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Asterisk does not properly detect when a caller hangs up the phone. How do I fix this?
Views: 10207, Votes: 8

Posted:
11 Mar, 2006 - Brooks M.

Updated:
14 Mar, 2008 - Support D.
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There are several settings in zaptel.conf and zapata.conf that you can experiment with.  If you are using loopstart, try using kewlstart instead.  Kewlstart is loopstart with disconnect supervison.  Your telco must have whats called "disconnect supervision" configured on the line. Another name for disconnect supervision is "forward disconnect".

You may also edit the ZT_KEWLTIME variable in zaptel.h.  Navigate to the #define ZT_KEWLTIME line and change the value from 500 to 1000 (You'll need to recompile zaptel before this takes effect).

You can enable busydetect and busycount to detect when a call has been hungup.  Set 'busydetect=yes' and 'busycount=10'.  You may experience hangups if your busycount number is too low, so increase the number until you find a variable that you're comfortable with.  You can also try enabling callprogress, and set your progzone to your current country code.  Callprogress is experimental, so if you experience frequent disconnects, you should disable it.  Busydetect and callprogress are ways to try and detect a hangup in software which isn't as reliable as having the actual signalling indicate the hangup.

If you're telcom uses polarity switching to signal for answer and/or disconnects, you should use 'answeronpolarityswitch=yes' and 'hanguponpolarityswitch=yes'
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