Voice And Standards
Rotary vs. Dual Tone Multi-Frequency Dialing (DTMF)
Dual Tone Multi-Frequency (DTMF), also called "Touch tone", was first introduced in 1963 by AT&T as a means for the central office to set up calls at a faster rate. Its roots are traced back to the 1950s when AT&T first developed a technique called MF (Multi-Frequency) which was first deployed within AT&T's telephone network to direct calls between switching facilities using in-band signaling (Durda, 2003). 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......
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