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How Do I Filter Phone Calls on a Land Line?

An anonymous reader asks: "I have a telephone on a plain old land-line, with the option of subscribing to caller-id. I would like to filter incoming phone calls, diverting them to either the handset or answering machine, based on whether the caller-id matches a list of trusted phone numbers. Considering that many of today's land-line telephone handsets can display caller-id and store a list of favourite phone numbers, I don't think this is technologically difficult. AI am not interested in: subscribing to a service provided by my telephone company. I would prefer the filtering occurred on my side of the phone line, or implementing a software solution on my PC. Frankly, that is overkill, and I don't want my PC turned on permanently. I would prefer something like a small, solid-state hardware device. Is there any such thing available?"

12 of 181 comments (clear)

  1. There is by Anonymous Coward · · Score: 5, Funny

    I beleive it's called a "wife". However, it's very very hard to pick these things up at a hardware store, and you can't get them off the internet (or at least the internet versions don't handle english language filtering all that well). I'd suggest that looking for more information on wives from slashdot is probably a waste of time.

    1. Re:There is by MarkGriz · · Score: 4, Funny

      Even if you were to obtain a "wife", they are notoriously difficult to program, and periodically
      exhibit erratic behavior that is difficult to diagnose.

      I believe the "Asterisk" solution suggested earlier would be less troublesome, and far less costly to operate.

      --
      Beauty is in the eye of the beerholder.
    2. Re:There is by Kadin2048 · · Score: 5, Funny
      I beleive it's called a "wife".
      I've seen some reports that would indicate that the TCO of many "wife" implementations is rather high. Vendors are often willing to subsidize the rollout, but pretty much leave you on your own after that in terms of maintainence. Not to mention that once you contract, it can be notoriously difficult to bring in outside consultants down the road.
      --
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    3. Re:There is by darthnoodles · · Score: 4, Funny
      periodically
      Well played pun.

      It was meant to be a pun right? Right?

  2. You're on the wrong site... by Anonymous Coward · · Score: 0, Funny

    what kind of nerd are you? You turn your PC off? Get off this site.

  3. Oh comeon, you know the answer.... by ShyGuy91284 · · Score: 3, Funny

    Hook it up to a Linux box, and..... Yeah, that's all I've got.... It's probably possible though with the right kind of modem hardware and drivers.

    --
    In undeveloped countries, the consumer controls the market. In capitalist America, the market controls you.
  4. ISDN by jaredmauch · · Score: 2, Funny

    What you want is to convert your home line to ISDN and use an old motorola BitSurfr device. You hand the calls over to the POTS ports on the device, and you can program it with AT commands. I think you can only set a small number of blacklist caller-id, or whitelist caller-id (i think 10) but it will serve as a nice filter. This will do what you want, and they can get dumped or a busy before the phone even rings.

  5. Re:Asterisk by Forge · · Score: 2, Funny

    It is EXACTLY what the poster asked for.

    If it's a little overpriced then maybe you can get your techi friends togather form a startup, get some venture capital and produce a competing product at $50 that would just sweap the market.

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    --= Isn't it surprising how badly I spell ?
  6. you will need by Bitsy+Boffin · · Score: 4, Funny

    1 sound muffled box containing
        phone with answering machine
        digital camera
        laptop with OCR and RDBMS software
        microphone
        robotic hand

    have the laptop listen to the microphone for noise (phone ring), the robotic hand should then hit the button on the camera which takes a picture of the LCD display on the phone showing the number, the image is transferred to the OCR software which returns the number, lookup the number in the RDBMS, if it's ok the robotic hand pushes open the lid on the sound muffled box "letting the ring out", if it's somebody you really don't want anything to do with the robotic hand lifts the phone and hangs up, in all other cases the phone is left to ring in the sound muffled box until the answering machine picks up.

    Problem solved.

    --
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  7. Re:It goes both ways. by LordNightwalker · · Score: 2, Funny

    I probably don't want to talk to a person who screens calls like that.

    And judging from your attitude, you're probably the reason they screen their calls like that, so I doubt they want to talk to you. You're happy, they're happy, the world just became a better place.

    I certainly won't talk to a machine. I might stumble over my words. Am I supposed to have a ready-made speech for you to record?

    Well, did you have a ready-made speech for the occasion where I actually pick up the phone? No? Damn, how do you intend to convey me your message? What? Improvise, you say? Well, what's so hard about improvising to a machine? "Hey, it's me, John. I just wanted to tell you Jeff couldn't make it to our D&D session tonight, so we could either reshedule for tomorrow if that's OK with everyone, or just skip this week and meet again next week. Let me know if tomorrow is OK with you or not, k? Bye man." Whoah, that was *HARD*!

    It's not as if I could call back later to delete the message I left, or could determine if you got the message.

    It's not as if you could call back later and change whatever you said in our first conversation either. However, you could call back, and tell me you made a mistake and correct it. You can do the same with the answering machine by leaving a second message. And if it's important for you to know if your message has been received, you just say "call me back as soon as you get this" at the end of the message, and guess what... As soon as I get your message, I will call you back.

    I may be paying long distance charges.

    You would be paying long distance charges regardless of who's picking up the phone: me, or the machine. If it's me, chances are you'll be talking a lot longer than to the machine, and pay more to get your message accross. If the machine picks up, I'll have to call you back, and you can talk to me for free. I don't see your problem.

    So, screw you. I have better things to do. I could talk to some nice and friendly people.

    Really? You're so amusing when you lie, you know that? If you really had better things to do, or nicer and friendlier people to talk to, why did you just call me?

    --
    Install windows on my workstation? You crazy? Got any idea how much I paid for the damn thing?
  8. Re:Asterisk by Doc+Ruby · · Score: 2, Funny

    Just to beat this dead horse into an ass:

    "Hey, I'm hungry. I'd prefer not to eat at home. Probably takeout to the park or sitdown. Frankly, sitdown is too much like home, and I don't want to be inside. I'd prefer to go to the park."

    If you said "let's go sit down at the burger joint", though the park is open and right next door, you'd be eating alone. I'd go to the park with someone else.

    You're a sorry Anonymous retard Coward. You should eat alone for the rest of your life.

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    --
    make install -not war

  9. Re:It goes both ways. by operagost · · Score: 2, Funny

    Only on Slashdot must nouveaux-luddite people be instructed how to leave messages on answering machines. It's not 1965, people.

    --

    Gamingmuseum.com: Give your 3D accelerator a rest.