From: Niall O Broin (niall at domain linux.ie)
Date: Tue 28 Aug 2001 - 23:59:45 IST
On Wed, Aug 29, 2001 at 09:52:11AM +0000, Vincent Cunniffe wrote:
> Ronan Waide wrote:
> > some time back when I was busy trying not to delete the Tech TV
> > website, I asked on its bulletin board if anyone had the specifics of
> > eircom's caller ID implementation. The approximate answer I got
> > revealed that that wasn't really the question I wanted to ask; what I
> > meant to ask was, is there a modem available that understands
> > eircom's CID implementation? It seems to defeat pretty much anything I
> > have available to me, presumably due to it not being adherent to
> > standard XYZ. Pointers appreciated, thanks.
> Dunno about 56k, but standard ISDN cards seem to pick up Eircom's CID
> scheme easily enough, and report incoming calls correctly in the logs.
This is not strictly correct. Yes, ISDN cards see the incoming number but
this is because ISDN is a digital protocol and there's no ringing tone -
instead, there's an incoming call packet, part of whose contents is the
calling subscriber's number - this is extracted from the packet by I4L and
put in the logs.
Caller ID as commonly referred to is an add-on to a POTS (analog) line which
allows for the sending of the calling subscriber's number alongside the
ringing tone - I don't know how, but I'd guess DTMF as there's so much telco
kit which can handle DTMF. However, how is not germane here. I'd imagine
that Eircom has used the same kind of Caller ID kit as is used in the U.S.
for the simple reason that you can buy so much Far East produced Caller ID
kit in Ireland. I'm presuming this stuff works, else the shops would soon
stop selling it, as they're not in business to accept returns. And you may
be sure that this kit is not made in a special version for the Irish market.
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