|
Related articles:
Ringback tone
Telephone keypad
Rotary dial
Frequency-shift keying
Amateur radio
Key terms: dtmf used tone calls system dialing keys signaling telephone frequencies network hz lines bell priority low cable switching station pulse heard dtmf tones keypad equipment caller method information c and d decoded pressing multiple companies technical united states disconnect flash override two frequencies switching center Search external links cited by footnotes on Wikipedia page Dual-tone multi-frequency: |
|