We have a Sentry Call Blocker Model CT-CID868 for our land line. It works beautifully. Initially, you enter all the good numbers (family, friends and neighbors) you want to ring through to you. This is not a hard thing to do. I recall it took about 15 minutes, using the phone list on my cell phone. This creates the "white list".
For numbers not in the white list, there is a recording which tells the caller, "if you are telemarketer, hang up and take us off your list. If not, hit zero and leave a message." For calls not on the white list, we hear the phone ring once. Since we installed the call blocker, the number of single rings has gone down dramatically. In addition, if you are so inclined, you can add numbers to the "black list" (sounds a bit racists, but that is Sentry's nomenclature). For those numbers, you won't even hear the single phone ring.
The unit costs about $80.
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