How are DTMF tones generated?

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Tags

  1. #dialing
  2. #telephone
  3. #pressed
  4. #frequency
  5. #generated
  6. #button
  7. #keypad
  8. #touch
  9. #instrument
  10. #column
  11. #tones
  12. #group
  13. #other
  14. #buttons