Draytek Vigor2920n User Manual page 267

In addition, you can press the Advanced button to configure tone settings, volume gain, MISC
and DTMF mode. Advanced setting is provided for fitting the telecommunication custom for
the local area of the router installed. Wrong tone settings might cause inconvenience for users.
To set the sound pattern of the phone set, simply choose a proper region to let the system find
out the preset tone settings and caller ID type automatically. Or you can adjust tone settings
manually if you choose User Defined. TOn1, TOff1, TOn2 and TOff2 mean the cadence of the
tone pattern. TOn1 and TOn2 represent sound-on; TOff1 and TOff2 represent the sound-off.
Region Select the proper region which you are located. The common
settings of Caller ID Type, Dial tone, Ringing tone, Busy
tone and Congestion tone will be shown automatically on the
page. If you cannot find out a suitable one, please choose User
Defined and fill out the corresponding values for dial tone,
ringing tone, busy tone, congestion tone by yourself for VoIP
phone.
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Vigor2920 Series User's Guide