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Section 300-Installation Chapter 7. Specifications
DBS-2.3/9.2-300 DBS Manual - Revised April 2000 7-17
Table 7-18. DTMF frequencies
Dial tone 400 Hz Continuous
Ringing 400 Hz 1 on/3 off
Busy 400 Hz 0.5 on/0.5 off
Voice mail ringing 550/400 Hz at 16 Hz 2 on/2 off
Digit Frequency (Hz)
1 697 + 1209
2 697 + 1336
3 697 + 1477
4 770 + 1209
5 770 + 1336
6 770 + 1477
7 852 + 1209
8 852 + 1336
9 852 + 1477
* 941 + 1209
0 941 + 1336
# 941 + 1477
Tone Name Frequency Timing (seconds)