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A dial-tone is played when the device is in dial preparation phase:

• Pick-up handset
• Press Handsfree key
• Put call on-hold

If users are using a headset, an option to not play a dial-tone is often preferred. When a call is put on-hold so the user can search something or a number, the headset will play the dial-tone and this is not user friendly.

From software 3.17, we offer the option to disable the dial-tone.