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- Newsgroups: comp.dcom.modems
- Path: sparky!uunet!gatech!rpi!usenet.coe.montana.edu!news.u.washington.edu!uw-beaver!uw-coco!nwnexus!ole!ssc!tad
- From: tad@ssc.wa.com (Tad Cook)
- Subject: Re: Caller ID
- Organization: very little
- Date: Thu, 27 Aug 1992 17:45:20 GMT
- Message-ID: <1992Aug27.174520.7505@ssc.wa.com>
- References: <94515@bu.edu>
- Lines: 32
-
- In article <94515@bu.edu> nicos@cs.bu.edu (Nicos Kontopoulos) writes:
- >
- >How does caller-ID work?
-
- The telco sends you the phone number of the calling party between
- the first and second ring. It uses FSK at some slow speed. There
- is no handshaking between your modem and the telco. Your modem is
- "passive." You cannot do this with a standard modem, although
- some new modems have this feature added. Caller ID boxes cost
- about $50. I think there are some cheaper ones.
- >
- >My understanding thus far is that when I call someone with caller-ID,
- >she/he can recognize my phone number. How is this achieved?
-
- Their local exchange gets your phone number through some backbone
- network (SS7?) and sends it to their caller ID box between the
- first and second ring. Not all exchanges send the ID, and
- if the call is coming in long distance, it will probably not
- ID, although this may change in the future.
-
- >
- >Isn't there a service provided by the phone company that does the
- >same?
-
- This IS the service provided by the phone company!
-
-
-
- --
- Tad Cook | Phone: 206-527-4089 (home) | MCI Mail: 3288544
- Seattle, WA | Packet: KT7H @ N7DUO.WA.USA.NA | 3288544@mcimail.com
- | Internet: tad@ssc.wa.com or...sumax!ole!ssc!tad
-