We currently have Brink's security system and pay Comcast for a VOIP line for the security system to use. We don't use that line for anything else and I feel that it is a waste of money. Is there any types of home security system that works through broadband or wi-fi? Thanks.

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Home security systems usually work by phone, but the phone line isn't secure (it's too easy to cut), so they use VoIP. You're right, though - they should come into the 21st century and use plain TCP on the internet line. (Maybe you can convince them to hire me to write the software and develop the hardware they need?)