Because Asterisk expects voltage to be removed from the line to indicate that the call has been disconnected. No PBX that I know of provides that. They just provide a busy signal tone. PBX's tend to be pretty good about figureing out when a call has disconnected. There's a MUCH better chance that the PBX will see Asterisk hanging up the call when it's Asterisk FXS -> PBX CO than when it's PBX FXS -> Asterisk FXO.

Still no guarntee it will work, but I've just found that it works better in the two instances I've done something like this.

Nick Cobley wrote:
Excellent news :)

We will be hooking up our system to a number of PABX's over the next
few months, of which I expect a lot of them to be pre stone age. Is
hooking it up this way preferable to using an FXO module? I can see
there is a cost advantage as a lot of these systems are maxed out or
not able to provide the 2 wire extensions, but in a lot of cases they
seem to have CO lines spare.

But just wondering if there is actually any technical advantage to
hooking it up this way?


On Wed, 10 Nov 2004 21:58:41 -0600, Eric Wieling <[EMAIL PROTECTED]> wrote:

Nick Cobley wrote:



I have a need to connect up asterisk to an Exicom GSX 418/816, this
will be a very simple setup, just one extension on the Asterisk box so
only one line to the PABX required.

Problem lies in the Exicom being a Key system and and we cannot source
any Single Line Modules for this system to allow me to interface this
with and FXO module. So I was thinking, would it be technically
possible to use one of the CO and hook that upto an FXS module on
Asterisk?

I'm kinda desperate to make this work!

This is the best way to do it. Use a Digium FXS module and plug it into the CO port on your PBX.
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