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Parameter # Description Units
75 DTMF transmit delta low group. The relative transmit level for the low group of
frequencies in the DTMF tone pair.
Country Default
United States 20 (–0.1 dBm)
Australia 20 (–0.1 dBm)
France 20 (–0.1 dBm)
Germany 20 (–0.1 dBm)
Netherlands 20 (–0.1 dBm)
United Kingdom 20 (–0.1 dBm)
India 20 (–0.1 dBm)
Korea 20 (–0.1 dBm)
China 20 (–0.1 dBm)
1 (0 to 40)
76 DTMF duration and interdigit time. Duration of each DTMF signal and the
duration of the interdigit silence.
Country Default
United States 70
Australia 85
France 80
Germany 90
Netherlands 80
United Kingdom 85
India 70
Korea 100
China 70
1 ms (40 ms
to 200 ms)
77 (Reserved)