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Before DTMF's introduction in 1963, most calls within the phone system were dialed using pulse signals, also called "rotary dialing". This form of dialing used to take approximately 11.3 seconds to dial a 10-digit phone number using rotary pulses. When DTMF was introduced, a ten-digit phone number can be dialed within or less than a second. DTMF makes telephone communications more efficient because it resulted in faster call set-ups by the central office (Dodd, 1999).
Wide Area Telephone Service vs. Leased Lines
WATS (Wide Area Telephone Service) is a telephone service that offer fixed-rate long-distance phone service for businesses...
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