Mercedes-Benz E-Class Sedan Operator's Manual page 221

Radio commands
Command
Media player commands
Radio commands can also be used when the
radio application is running in the background.
Function
To call up receivable or saved stations
Direct frequency entry
To switch to the next available station
Station is saved in the station list
To display the names of all receivable stations
To listen to the names of all receivable stations
To switch the traffic information service on/off
To switch the current station information on/off
Media player commands can also be used when
the media player runs in the background.
Voice Control System 219