Spam Filter for Inbound Telemarketing Calls

Over the years, I’ve grown slightly more cynical and less willing to accommodate unsolicited sales pitches. I don’t try to be rude, or slam the phone down. But there are only 480 minutes in any regular work day. Too much of this time already gets chewed up in less-than-productive activity. So I try to save the telemarketer’s time (and mine) by getting to the point very quickly. In short: if they’re not responding to a request or product inquiry that originated from us, we ask them to send an e-mail to our general ContactUs address.

But some simply will not take “No” for an answer. Some try calling repeatedly, dialing different extensions at different times of the day–almost to the point of harassment. For these, we have the perfect solution:

At our office, we’ve written an application that displays our Asterisk phone system’s call history database. For any phone number that’s in the database, we select the record, then press the Blacklist button to add the phone number to our blacklist database. As a result, all future calls from these repeat offenders dump into our general voicemail box immediately. It would have been just as easy to simply disconnect the call, but we give them the option of leaving a voicemail just in case. Oftentimes they decide to stop calling of their own accord, once they realize we’re not going to waste valuable time explaining why we’re not interested.

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