2005 Mercedes C-Class Owner's Manual - Page 211

Controls in detail Audio system PIN entry i If the PIN is entered incorrectly three times, NEED PUK will appear in the display. Enter PUK via your telephone. Please refer to the separate telephone operating instructions for more information. Placing a call Entering a telephone number and starting the dialing process Enter PIN number using buttons 1 to R. If necessary, correct number entered with the CLR soft key. Press soft key briefly to delete the last digit entered; press soft key and hold to delete the complete number. Press OK soft key after entering correct PIN. READY or ROAMING will appear in the Adjusting the volume Turn rotary control of N button during a telephone call. The volume will increase or decrease depending on the direction turned. Enter desired telephone number using buttons 1 to R. The number can have up to 32 digits, but only twelve of these are visible in the display. i The volume can be adjusted separately for telephone mode and audio mode. Adjusting sound Adjust sound during a telephone call. Sound adjustment ( page 187). display. 209