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

[Jeffrey C. Ollie]

On Wed, 2005-05-04 at 01:08 +0300, Tzafrir Cohen wrote:
> On Tue, May 03, 2005 at 03:11:24PM -0500, Jeffrey C. Ollie wrote:
> > On Tue, 2005-05-03 at 12:44 -0400, Matthew Butt wrote:
> > > 
> > > 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.
> 
> Which telcos use loopstart?

I don't know about outside the US, but the majority of analog lines to
homes and small businesses in the US are loopstart, as opposed to
groundstart.  Groundstart is available, but most consumer telephony
devices sold in the US do not support it.

Jeff



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