[Asterisk-Dev] ZAPTEL driver questions - loop start hangup

[Jeffrey C. Ollie]

On Tue, 2005-05-03 at 12:44 -0400, Matthew Butt wrote:
> Hi all,
> 
> I'm trying to get UK BT Featurelines running with X100P cards.  BT tell
> me that they're running Loopstart but without disconnect supervision.
> When a caller hangs up BT don't send any kind of busy/dial tone so
> there's no audible way of telling that a call has finished.
> 
> With the zap drivers running fxs_ls in debug mode I can see NO BATTERY
> then BATTERY (is this called a debounce?) when the caller hangs up but:

Well, it looks like BT lied to you.  The loss of battery voltage is
disconnect supervision.  Change the Zaptel drivers and Asterisk to use
kewlstart signaling, which is loopstart plus disconnect supervision.

Jeff


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