2010 Mercedes C-Class Owner's Manual - Page 175

Audio system RREADY RNO 173 indicates that a call is possible. SERVICE indicates that the mobile network is not available. Setting transmit and receive volume i These settings should normally not be changed as the factory settings are matched to most mobile phones. Find out about the optimum settings for your mobile phone at an authorized Mercedes-Benz Center. i Changes may result in significant impairments to the transmission quality. These settings may not be changed during an active phone call. X Consult the separate mobile phone operating instructions that came with your mobile phone for information on how to place a "911" emergency call on the mobile phone. The following conditions must be met for a "911" emergency call via the audio system: RMobile RThe phone must be switched on. corresponding mobile communications network must be available. % Q Tel Q Bluetooth Phones. X Select a mobile phone from the list. X Select Options Q Reception Volume or Transmission Volume. X Setting the volume: Slide ZVÆ or rotate cVd the audio controller. The volume bar moves up or down. X Exiting menu: Press W or slide XVY the audio controller or press button k. i Emergency calls may not be possible with all telephone networks or if certain network services and/or telephone functions are active. Check with your local service providers and mobile phone instructions. If you cannot make an emergency call, you will have to initiate rescue measures yourself. Placing a "911" emergency call using audio control unit with the mobile phone unlocked X Emergency calls "911" i The "911" emergency call system is a public service. Using it without due cause is a criminal offense. i This function places a call to the local "911" provider. It does not initiate a Tele Aid call. The following describes how to dial a "911" emergency call using the audio system head unit when a Mercedes-Benz specified mobile phone is connected via the Bluetooth® interface to the audio system. Unless otherwise specified, the descriptions refer to the audio system head unit. Press button % to switch to telephone mode. X Enter 911 using the number keypad on the audio control unit. X Press button 6. or X Press W for dialing to begin. Connecting...appears in the audio display while the mobile phone establishes the connection. X Wait until the emergency call center answers, then describe the emergency. i Depending on the phone type, if no SIM card is inserted in a GSM mobile phone or if there is no service on a CDMA mobile phone, NO SERVICE may appear in the audio display. In that case, you only can make an emergency call on the mobile phone itself, without the use of the audio control unit. Z Controls in detail