BusinessPhone – Dialog 4223 Professional / Dialog 3213
Other Useful Features

## DTMF Tones

The DTMF function is used to control answering machines or any other telecommunication devices.

Make an internal or external call to reach the desired device.

When your call is answered you can continue to dial digits which will be sent as DTMF digits (tone signals) to the called device in order to activate the desired functions.

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