[Asterisk-Users] Connecting to Exicom GSX 418/816

[Eric Wieling]

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 <eric at fnords.org> 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.