> I heard today that Bell of PA is now offering the Caller*ID feature
> I have a few questions first:
> 1) What areas do the incoming calls have to come from for the number
> to be displayed? Do they have to be local, from within PA, from an
> area that also has Caller*ID, or will every number show up? What about
> long distance numbers? I get most of my calls from Baltimore,
> Pittsburgh and Boston. I'm in Philadelphia.
(sigh). I really oughta put this in a file and just copy it when the
question comes up... (but will I? Probably not...)
For Caller*ID information to be displayed, assuming you have
subscribed to Caller*ID and have the Caller*ID box (and therefore your
CO is equipped with the appropriate hardware and software), one of the
following must be true:
1. The caller must be calling from a phone subtending the same CO you do;
2. The caller must be calling from a phone subtending a CO which is
equipped with SS7 (common channel signaling system #7), which is in the
same LATA as your CO.
(At some time in the future (beyond 1991), when Interexchange Carrier
SS7 interconnection is available, add:)
3. The caller must be calling from a phone subtending a CO which is
equipped with SS7, run by a telco which has SS7 connectivity with the
caller's IC, which has SS7 connectivity at the appropriate tandem
switches, and has SS7 connectivity to your telco.
In practical terms: Today, you would get the calling number from calls
inside your LATA (in the philly area, generally local calls), from COs
which are SS7-connected (not intuitively obvious which are, but
generally some reasonably high percentage of "major" COs in the LATA
will be SS7-connected before a telco will offer CLASS).
You would not get calling number from Pittsburgh, Baltimore, or Boston.
At some point in the future -- but not before mid-1991, most likely --
you would start getting some calling number delivery from outside your
LATA. There are so many variables involved that I won't even *try* to
predict where you would and would not get delivery.... save to say
that Pittsburgh would be your best bet (Bell of PA), followed by
Baltimore (C&P of Maryland, different telco but part of Bell Atlantic)
followed by Boston (different Regional Company -- NYNEX).
David G Lewis ...!bellcore!nvuxr!deej
"If this is paradise, I wish I had a lawnmower."