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SecurityLink from Ameritech SecurityLink from Ameritech provides the broadest range of security monitoring services to 1.3 million residential, commercial and government customers throughout North America. The company serves 100,000 homes and businesses across Canada through branch offices and over 456 security systems dealers. Services include burglar alarms, fire/carbon monoxide detection, card access systems, CCTV and "critical condition" monitoring (temperature, fluid levels, power, emissions, etc.).