TANDBERG 880 MXP - Manual (Page 45)

General Use
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3.2.7 Touch Tones
To activate dialing touch tones during a call, press the Touch tones button. Otherwise the number
keys will work as configured in the Number Key Mode, see Control Panel – Menu Settings –
Number Key Mode. An indicator will let you know that Touch tones are enabled. Press OK to exit
Touch tone mode.