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To be included within the discussion is comparisons of telephone dialing sounds, Wide Area Telecommunications Services (WATS) versus leased lines, Private Branch Exchanges (PBX) or Centrex, and the International Organization for Standardization-Open Systems Interconnection (ISO-OSI) model.
What are the differences between Rotary and Dual Tone Multi-frequency (DTMF)? Rotary dialed phones were round and "spun" to make a phone call. The disk had the numbers 0-9 and one had to place a finger in the hole next to the number they wanted to select and turn the dial completely around then let go. When the disk spun back to its original position it would create a series of frequency pulses that corresponded to the number dialed and was known as "pulse dialing...
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