An anonymous reader writes: The relentless telemarketer's calls really upset me. The Do Not Call blocking does not work. Government does not seem to have better way to help us either. They just keep calling and calling, multiple times a day, sometimes waking me up at night. The recent really annoying one comes from "Free 3-in-1 Wireless Security System", using various Caller IDs, including (715) 304-0676, (682) 205-2766, (570) 867-8743, (904) 245-1611, (612) 314-9242, etc, calling me day and nights. My cell phone, with earlier version of Android and can't be upgraded, does not support number blocking functionality. And that's company's phone, for on-call production support, must be turned on 24 hours a day.
As a counter measure, I install Asterisk in my home Raspberry Pi, and set up a SIP trunking with a SIP service provider. That uses my money but it's not too much and I don't care to spend that. Using shell script, I randomly setup an outgoing caller ID for each call, and schedule a cron job to run every few minutes to automatically call one of any of my received telemarketing numbers. Once the call is pickup, wait 10 seconds and hang up. That is, I am using robot calls to defeat robot or human calls.
Please thank me if you receive fewer spam calls lately. And if you can do something similar as above, that will be even better. Together, we will defeat the harassment calls!