VTech ET685 Administrator And Provisioning Manual page 152

Setting
Audio:
Disable Casing Speaker
DTMF echo on Speaker
Phone
Web User Interface (WebUI) Reference
ET685 Administrator and Provisioning Manual
Description
Turn this setting on to disable your speaker.
Hearing DTMF tones during call initiation (dialing) is
enabled only for some tone schemes (due to each country's
ISDN standardization). However, some customers asked to
be able to disable these tones when in speaker mode, for
privacy reasons. You can disable them by turning this
setting to off. Please note that this setting has no effect on
handset/headset mode.
Here is the list of the tone schemes this feature will affect:
Australia

China

Denmark

Great Britain

India

Italy

Japan

Mexico

Netherlands

New Zealand

United States

Note: During a call the DTMF echo is always audible.
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