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DoorKing manufactures a
variety of access control products. These products include telephone entry
systems, telephone intercom systems, card access systems, digital access
systems, electromagnetic locks, high security RF access controls, automatic
vehicle ID systems, vehicular gate operators, parking control products, and
a variety of accessories to complete your access control requirements.
What's the difference between "Dedicated line" and "No
phone Bill" access systems for multi-users?
The first requires a extra phone line service where the second costs more
but uses a relay system for making connections.
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