Telephoning General Functions482.2.5 MutingPressing the muting key S deactivates the microphone during a call, and theperson at the other end of the line can no longer hear you. Press the key again toswitch the microphone back on.2.2.6 Call-charge Display, Duration DisplayIf your network operator transmits call charge information, and if you have dialledan external number yourself, you will see the current amount of the charge in theInfo line during or at the end of a call. The menu item 6 Charge settings in thePhone settings MenuCard lets you deactivate this or switch to the durationdisplay (see also MenuCard “Phone Settings” starting on page 107).2.2.7 Adjusting the Volume with the Plus/Minus KeyUse the plus/minus key = to adjust■ the volume of the loudspeaker in hands-free/open-listening mode,■ the volume of the handset during a call via the handset,■ the volume of the headphone during a call via a headset,■ or the volume of the ringer tone when you receive a call.When the telephone is in its idle state again, it reverts to the default menu setting.You can change the default setting using the 1 Volume menu item in the Phonesettings menu (see also MenuCard “Phone Settings” starting on page 107).2.2.8 RediallingPressing the redial key W displays a MenuCard containing the last numbersdialled (with the most recent entry at the top). If a call number is also stored inyour system’s telephone book, you will see the name as well.