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- 23. What are the DTMF frequencies?
-
- DTMF stands for Dual Tone Multi Frequency. These are the tones you get when
- you press a key on your telephone touchpad. The tone of the button is the
- sum of the column and row tones. The ABCD keys do not exist on standard
- telephones.
-
- 1209 1336 1477 1633
-
- 697 1 2 3 A
-
- 770 4 5 6 B
-
- 852 7 8 9 C
-
- 941 * 0 # D
-
- 24. What are the frequencies of the telephone tones?
-
- Type Hz On Off
- ---------------------------------------------------------------------
- Dial Tone 350 & 400 --- ---
- Busy Signal 480 & 620 0.5 0.5
- Toll Congestion 480 & 620 0.2 0.3
- Ringback (Normal) 440 & 480 2.0 4.0
- Ringback (PBX) 440 & 480 1.5 4.5
- Reorder (Local) 480 & 620 3.0 2.0
- Invalid Number 200 & 400
- Hang Up Warning 1400 & 2060 0.1 0.1
- Hang Up 2450 & 2600 --- ---
-