Your question doesn't seem clear on which way you have set up already.

Phone -> Asterisk -> legacy PBX -> one of the 23 extensions
Or the other way?

The capabilities of your specific existing PBX and asterisk need to be
matched up. With an FXS you could have the other end dial with DTMF a string
like *5551212#5551213# and then have asterisk use the first number as
callerid.

All I know about PBX's is that somebody has done similar to that.


On Thu, Oct 22, 2009 at 11:48 PM, PATRICK KANGETHE
<[email protected]>wrote:

> I want to interface asterisk with a legacy pbx that has around 23
> extensions through my 8 fxs card, how do i work around this?
> Hint: I have already terminated 8 extensions from the legacy PBX, i was
> thinking whether i can peer the extensions from the PBX i.e like 5
> extensions be peered to one extension connecting to the fxs? How can i do
> this?
>
> Thanks in advance,
>
>
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