I think I know the answer to this. I am an electronics hobbyist, and have been a subscriber to “Poptronics” magazine for years. Anyway, in the May 2001 issue, there was an article titled “Telemarkerters’ [sic] Nightmare!”.
It addresses the issue at hand, and gives a way to combat against it.
Paraphrasing the article…
Telemarketer’s have computers set up to automatically dial phone numbers. Once the computer determines that it has a live person on the line, the call is switched to an operator. Your name and number may appear on their screen, which explains why they sometimes identify you by name.
The switch from the dialing computer to live operator takes time, and explains why you sometimes hear a pause after you answer a call. This is a clear sign that you are being called by a telemarketer.
Their systems are set up so that when their computer calls your number, it monitors the audio. If it hears a short burst of audio, it logs that as a live person (“Hello?”) and routes the call to an operator. If it hears a long burst of audio, it assumes an answering machine is in use, logs your number as a “hit” to be called back later, and hangs up the phone.
The telephone company has adopted a “Special Information Tones” scheme, whereby non-working numbers emit a series of tones to the calling entity which tell said entity that it has reached a “non-working” number. You’ve heard these three tones countless times…they are the “do-duh-dee” tones that you always hear just before you hear the recorded “We’re sorry, but the number you have reached…”
Most telemarketing computers recognize these tones and hang up right away (and never call back since it is then non-productive to do so).
So, by adding these tones to your answering machine message, you can fool the telemarketer’s computers into logging your number as “non-working”, hence removing you from their list.
------------- (end paraphrasing)
The solution in the magazine is to add these tones to your machine. You can download the tones (in .wav format), according to the article, from ftp://ftp.gernsback.com/pub/pop. Once there, DL the sit.wav file. (Was unable to make a vB link to this ftp file…any suggs?)
The process is to record these tones onto your answering machine message so that they are always transmitted (played) from your machine.
The problems (IMHO) are that this will only work if:
- You have an answering machine which will allow you to…
- Record/dub the tones onto the message tape, or…
- You can somehow get these tones included on your voice mail, and/or…
- You have caller ID, which will allow you to determine who is calling before you answer (thereby enabling you to “let it happen”).
In any event, the author of the article in the magazine provided contact information in a sidebar:
John Carter
JECH TECHnologies, Inc.
13962 Olde Post Rd.
Pickerington, OH 43147
800-631-0349
Bottom line - this may or may not be feasible for you to do, but at least it provides a little insight…
Also, there is a feature that (I believe) is free and available to all phone customers that will block incoming calls from phones which are hiding their identity (people can press *67 to “call anonymously”).
Someone correct me if I’m wrong, but I believe that picking up your phone and pressing *77 will prevent calls from anonymous users (which show up as “private, etc”) from being able to reach you (instead they will get a message from the Telco stating that you are only accepting calls which have not been masked) or something to that effect.
Anyway, hopes this helps…