Re: pabx caller id bypass

From: peterken (peter273_at_hotmail.com)
Date: 12/06/04 

Date: Mon, 06 Dec 2004 10:31:56 GMT

"Dmitri(Cabling-Design.com)" <info_at_cabling-design_dot_com@foo.com> wrote
in message news:1OQsd.4168239$yk.629653@news.easynews.com...
> peterken wrote:
>
>
> > hello
>
> > I was wondering if anybody knows how to bypass a PABX for caller-ID
> > information, so the internally connected handsets having the feature of
> > showing caller-ID actually show it...
> > Most PABX do not transfer this caller-ID information to the internal
> > lines
> > :-(
> > Could it be done using some passive filter system ?
> > Or does it need optical insulation and active parts ?
> > Did anybody here already try to bypass it ?
> > Has anybody have any information on the signal level and
> > "frequency" of
> > caller -ID ?
> > (I do know it's sent *before* the actual ringing signal, but that's
> > about
> > all)
>
> > thanks
>
> Most current PBX do transfer caller ID to their extensions, as long as the
> analog trunk interface cards are of Caller ID supporting type. Some older
> (Key systems) can also be upgraded to support caller ID by updating their
> processor card (and trunk card(s) where needed). You cannot actually
> bypass the processor board of the PBX to make the Caller ID ride to the
> extension for several reasons:
> #1 the phone sets should have internal feature to show Caller ID, and not
> just the display. Only analog phones would qualify, not the PBX feature
> phones.
> #2 the processor actually stores the Caller ID info, and then transfers it
> to the feature phones using its own, proprietary protocol. This protocol
> is pretty heavily guarded by the manufacturers (because it lets them sell
> more feature phones), and it is not the same as the Caller ID you'd get
> from the PSTN to your regular house phone.
> #3 it is the processor that decides which extension the call will go to,
> so how do you know beforehand which extension is going to receive the
> CallerID sequence?
>
> If you get lucky, and you have a key system (not a PBX), and your trunk
> cards are supporting Caller ID, you may try to use a separate caller ID
> device to see if it actually gets through or, alternatively, hook the
> caller ID device directly to the incoming lines, especially if your
> extension is only picking up one line.
>
> Good luck!
>
>
> --

- well, it's an analog pabx, call it an internal central passing calls from
outside line to multiple internal phones
- depending on who picks up first gets the call
- more as one internal phone supports caller-ID
- the actual switching in the pabx is done using ordinary relays
(might be interesting : type pabx is Profoon CX28 see www.profoon.nl under
http://www.profoon.nl/telefoon/centrale/cx28.PDF )

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