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Originally Posted by scastle
One thing: Even with CLI, you are not protected against cold callers. Their number is often withheld. How are you going to block them? Not answer callers with withheld numbers? If you do, bear in mind that somebody with a legit reason to contact you may be unable to get through because their number is withheld (for instance, some hospital switchboards automatically withhold the number).
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I do exactly this on my NTL line. If I recognise the number as somebody I want to speak to I answer the phone. If the number is withheld, not available or is an obvious company number (0845 etc.) I do not answer the phone and let it ring. If the caller lets it ring long enough (9 out of 10 times it stops after only three or four rings and so is obviously a sales call) they will get through to my voicemail. If they are a legitimate caller they can leave a message asking me to phone them back.
Since installing CallerID and VoiceMail I have not answered ANY unwanted phone calls and honestly cannot see myself being able to live without it.