Teltech Systems is a technology company that specializes in developing applications to combat unwanted phone calls and enhance digital privacy. The company is known for its flagship product, RoboKiller, which aims to block spam calls and provide users with tools to manage nuisance telecommunication. RoboKiller uses a combination of call blocking, spam detection, and customized answering techniques to reduce the number of irritating robocalls and telemarketing attempts received by its users.