2N EasyGate IP User Manual page 61

5.6.4 Busy Tone
The Busy Tone folder helps you set the dial tone parameters.
Frequency 1 – set the busy tone frequency. The default value is 452 kHz.
Frequency 2 – set the busy tone frequency.
Modulation – set the busy tone modulation:
330/330
200/200
250/250
375/375
500/500
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