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- Path: sparky!uunet!seismo!lll-winken!telecom-request
- From: dave@westmark.com (Dave Levenson)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Apartment Security Stupidity
- Message-ID: <telecom13.39.1@eecs.nwu.edu>
- Date: 23 Jan 93 15:01:26 GMT
- Sender: Telecom@eecs.nwu.edu
- Organization: Westmark, Inc.
- Lines: 67
- 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 39, Message 1 of 12
-
- Regarding apartment security systems, Pat writes (in part):
-
- > [Moderator's Note: All the landlord needs is a few long distance calls
- > made from that phone to demonstrate a 'regular phone line' is NOT a
- > cheaper way to go. Some landlords may even be too stupid to have those
- > phones blocked from 900/976/incoming calls...
-
- Where my parents live, the entrance phone translates a two-digit
- tenant number into a seven-digit POTS number, pulse-dials the number,
- and allows the tenant to unlock the door by a DTMF signal.
-
- The line is arranged for pulse-dialing only (which is why the phone
- uses pulses) and the transmitter is not enabled until dialing is
- complete. There is no switchook. Entry of the tenant-code causes
- the phone to go off-hook, pulse-dial, and then enable the
- transmitter. There appears to be no opportunity to enter
- tone-dialed digits, or to introduce additional pulses, or even to
- get the CO dialtone, other than the obvious possibility of
- physically intercepting the CO pair between the phone and the
- demarc.
-
- Tenants are encouraged to get call-waiting service, to reduce (but not
- eliminate) the busy-signal problem. The only obvious security hole
- here is the call-forwarding hole, and even that is under the control
- of the tenant.
-
- If I lived there, I'd much rather have that risk than have some
- strange CPE that is not under my own direct control sit between my
- telephone set and my CO loop. Wouldn't you?
-
-
- Dave Levenson Internet: dave@westmark.com
- Westmark, Inc. UUCP: {uunet | rutgers | att}!westmark!dave
- Warren, NJ, USA Voice: 908 647 0900 Fax: 908 647 6857
-
-
- [Moderator's Note: Well Dave, I'm not sure if I would or not. This
- would be purely an applications problem, and depend on several things.
- Since I keep my modems on a line totally separate from my 'voice'
- line, a call-waiting signal from the door would not influence the
- connection. As for a 'strange CPE that is not under your control', it
- is really designed to be transparent and I think the advantages out-
- weigh the disadvantages. To be sure, you cannot control the call-
- waiting, even if you otherwise have it turned off with *70. You cannot
- forward the calls, even if your phone is otherwise being forwarded.
- You can of course unplug the phone or turn off the bell in order to
- avoid the disturbance.
-
- On the plus side however, if you otherwise hate call-waiting and do
- not want it on the line for ordiinary phone usage, you still get the
- flexibility of responding to the front door without having to stay off
- the phone for some period of time when visitors are expected. You can
- forward phone calls while allowing visitors at the front door to leave
- a message on a cheap answering machine installed just for the purpose
- of picking up calls from the door. If front door calls were allowed to
- be call-forwarded, there is always the risk the place to where calls
- are forwarded would be busy. At least with an answering machine which
- answers the door (use one of those devices which listens to the ring
- and forwards to a device, i.e. fax, modem, etc to keep the answering
- machine from responding to regular calls) when you are gone, people
- could be given some message about 'I am busy now and can't receive
- visitors'; they would not be told you were on the other side of town
- somewhere and not possibly able to get home prior to them burglarizing
- your place and escaping at their leisure. So, you have to define your
- specific requirements to detirmine if a 'strange CPE in the line' is
- the way to go or not. Overall, I prefer the stand-alone units. PAT]
-