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- From: janson@crow.csrv.uidaho.edu (Todd Janson)
- Subject: Re: Cordless telephones
- Nntp-Posting-Host: crow.csrv.uidaho.edu
- References: <C1J809.M06@panix.com>
- Sender: news@moscow.uidaho.edu
- Organization: University Of Idaho.
- Date: Thu, 28 Jan 1993 04:35:33 GMT
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- Message-ID: <C1JrF9.A8G@moscow.uidaho.edu>
- Lines: 53
-
- : In <B8a1XB1w165w@msgpad.uucp> gabe@msgpad.uucp (Gabe Helou) writes:
-
- : >I have a couple questions regarding cordless telephones.
-
- : > What is the likelihood of another phone operating on the same
- : > channel as yours? Possible concerns include a) others being able to
- : > listen in on phone converstions and b) others being able to place
- : > calls via your phone line.
-
- : If you are going to worry about (a), realize that those who listen
- : in will be doing so on equipment other than cordless phones. Equipment
- : of choice includes baby monitors and scanners.
-
- : I would not worry so much about (b). Most phones (see the recent
- : Consumer Reports article) use codes so that it would not be
- : easy for someone else to use your base to dial calls.
- : >
- : > Is is possible to disable the base phone to prevent other handsets
- : > from dialing out?
- : >
- : See (b) above.
-
- : >My parents have just purchased a cordless phone and are concerned about
- : >unauthorized monitoring or use. This isn't my area of expertise, but I
- : >don't want to blow my image. Any information about cordless phones
- : >would be appreciated.
-
- : It is covered in my book about phone service -- "The Phone Book",
- : by Oppedahl. Your local library or bookstore should have it. The
- : publisher :) is Consumer Reports.
-
- Some other information of note: There are 20 frequencies that are used
- for cordless telephones. Since a cordless connection uses two frequencies,
- that means a total of ten possible channels which your phone operates on.
- Usually, the channel itself will be on the base, probably on the underside.
- Or, you may be able to switch channels to find the clearest one...some
- phone/base combos let you do this. The standard frequencies listened to
- by people with scanners are the set transmitted by the base units.
-
- So how safe is your phone conversation? Well, unless your parents purchased
- one of the real spendy 'secure' lines which encode everything, not safe at
- all. At least, not if you want to talk about anything confidential. For
- all you know, your neighbor is hanging on every word you say. And doing it
- quite legally, in fact, since the radio waves are public. On the other
- hand, there is your concern about someone dialing out. In general, don't
- worry about that at all. Unless the phone is among the first cordless
- phones, it has a security code set on both the base and the handset, usually
- accessible by opening the battery pack and flipping miniature switches.
- These switches control a signal sent out by the handset which must match
- the base in order to activate the connection. Unless someone knows your
- combo and has the same brand of phone, chances are unlikely that they will
- be able to use your phone.
-
-