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- Path: sparky!uunet!cs.utexas.edu!uwm.edu!lll-winken!telecom-request
- From: deej@cbnewsf.cb.att.com (david.g.lewis)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Do Telcos Record the Numbers of Local Calls?
- Message-ID: <telecom13.37.8@eecs.nwu.edu>
- Date: 21 Jan 93 14:41:31 GMT
- Sender: Telecom@eecs.nwu.edu
- Organization: AT&T
- Lines: 25
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 13, Issue 37, Message 8 of 15
-
- In article <telecom13.33.4@eecs.nwu.edu> dcoskun@alias.com (Denis
- Coskun) writes:
-
- > Do telcos record the dialed digits for all local calls?
-
- > My back-of-the-envelope calculation suggests that it is entirely
- > feasible for telcos to store the number of every single local call
- > that you dial: In a city with 1,000,000 phones, with an average of 10
- > calls a day on each phone, and logging both origin and destination
- > phone numbers (7 digits each, so 14 ASCII characters),
-
- Minor quibble: phone numbers are almost always stored as ten digits,
- but are stored in BCD, so that the total size of the phone number is
- five octets.
-
- > such a log would consume just 1,000,000 * 10 * 14 = 140 Mbytes per
- > day. That would fit on a tape which costs less than $20.
-
- Of course, they also store a lot of other information, such as
- originating number, call start time, call end time, etc., etc., etc.
-
-
- David G Lewis AT&T Bell Laboratories
- david.g.lewis@att.com or !att!goofy!deej Switching & ISDN Implementation
-