Re: Caller ID
Re: Caller ID
- Subject: Re: Caller ID
- From: Jens Bauer <email@hidden>
- Date: Wed, 11 Jun 2003 01:33:38 +0200
Hi Roger,
On Tuesday, Jun 10, 2003, at 22:07 Europe/Copenhagen, Roger Smith wrote:
Couple of things to bear in mind regarding Caller ID with the built in
modem from Apple. First off you need to make sure you have an Apple
USB Modem. The older Serial modem (original iMac, original graphite G4
tower) does not support caller ID.
The modem is, as far as I understand, an internal USB modem. The
computer was bought around august 2002 ("mirrored drive doors").
There are two types of Caller ID in the marketplace. Type 1 and Type
II . Type 1 Caller ID is *not* supported by Apple's USB Modem (Type 1
info is sent in between rings), however Type II Caller ID is supported
by the Apple USB Modem.
I know that the type that is used in Denmark, is called CLIP. It's
probably invented by someone at Tele Danmark (which is the danish
phone-company).
Until now, I've found out that the caller-id information is sent to the
subscriber by using DTMF tones, and it does not send a "wake" signal,
so that the computer would have time to wake up from sleep.
Type II Caller ID is how the Internal Apple USB Modem is able to
support v.92 and Modem on Hold functionality.
Note: For Type II Caller ID (With Apple's USB Modem) you have to have
an Active connection (i.e you can't sit there in zterm with the port
open).
Can you go into further details on "Active connection" ?
-does this mean that the caller-id is not transferred as text (like the
"RING" and "CONNECT xxxx" messages) to the application that opened the
device?
From what it sounds like, you need a modem which supports type 1
caller ID.
I'll try and ask TDC to send me some specifications on their protocols,
in the meantime, this URL might be able to tell you if it's a type 1 or
type 2 caller-id:
<
http://www.blichfeldt.dk/numviser/index.htm>
-and if you know how the electronics work, here's the schematics:
<
http://www.blichfeldt.dk/numviser/numviser.gif>
Do you know if it's possible to update the firmware in the modem, so
that it supports caller-id for Denmark ?
When looking at this site...
<
http://dspcollaborative.analog.com/developers/
DSP_CompanyListing.asp?c_id=9>
I can see that there are many different types of caller-id, which is
crazy, if you ask me.. ;)
-But you can see some information on CLIP used in Denmark here as well.
=)
Love,
Jens
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