Before caller ID became widely integrated into most over-the-counter telephones, you used to be able to buy add-on caller-ID boxes that could be programmed to block up to about a hundred numbers. They don't seem to be available any more. There seem to only be a handful of standalone caller-ID boxes still on the market, and I don't think any of them do blocking.
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timeasmymeasure
no subject
Date: 2009-01-31 07:45 pm (UTC)