Although we are on the do-not-call list, "research" companies and unscrupulous telemarketers call until 9pm, or later if, for example, they're calling from overseas and don't bother to keep track of time zones. We don't want the phones to ring while (and after) we're trying to get our son to bed by 8pm. With an automated option, we can stop unsolicited callers and avoid having to proactively inform and remind all our acquaintances that we wish not to take calls after 7pm.
We use whitelist entries for those few whom we know will only call us after hours in an actual emergency.
And yes, I do have a cron job taking care of it for now.
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