2008 MERCEDES-BENZ C300 Audio system

237 Controls in detail
Audio system
Making calls
Press buttonh on the audio control
unit to call up the telephone mode.
When the mobile phone is ready for opera-
tion, the display will look like this:
Initiating an outgoing call
Entering phone number via the audio
control unit
You can enter numbers and special charac-
ters via the telephone keypad.
Entering: Use 0 to 9, ô and ó to
enter characters.You can enter the * character by press-
ing the ó button once. You can en-
ter the + character by pressing the
ó once and then again within ap-
prox. 1.5 seconds.
To delete individual digits: Briefly
press buttonî in the audio control
unit.
To delete an entire entry: Press and
hold buttonî until the entire entry
has been deleted.
or
Press buttont.
Entering phone number via the audio
controller
In addition to the actual menu bar, the tele-
phone main menu features a second bar
containing numbers, the number menu.
When the bar is active (highlighted), you
can select elements.
To enter digits: Slideompor
rotateymz the audio controller to se-
lect the required digit.
Press n to confirm.
Repeat the procedure, until you have
select all digits for the necessary
phone number.
To delete individual digits:
Slideompor rotateymz to
selectõ and briefly pressn.
or
Press îbutton next to the audio
controller.

238 Controls in detail
Audio system
To delete entire phone number:
Slideompor rotateymz to
selectõ, press and hold n until
the phone number has been deleted.
or
Press and hold î until the entire en-
try has been deleted.
or
Press buttont.
To initiate a call: Slideompor
rotateymz the audio controller to se-
lect ö.
Press n to confirm.
or
Press buttons.
Initiating a call to a phone book entry
h
Name.
Select entry (page 234).
Press buttons or n.Initiating a call to a call list entry
h
Call Lists.
Select Calls Received or Calls Di-
aled
.
The appropriate list appears.
Select entry (page 236).
Press buttons or n.
Redialing
Press buttons.
or
Selectö and press button n.The dialed calls list appears. The call di-
aled last will be at the top of the list.
To select a call: Slideqmror
rotateymz the audio controller until
the desired entry is highlighted.
Initiating call: Press buttonn
ors.
Aborting dialing or ending a call
h
4 and press buttonn.
or
Press buttont on the audio control
unit.
iIn order to use the redial function, no num-
bers may have been entered.

239 Controls in detail
Audio system
Rejecting or accepting calls
You will be notified of an incoming call by
the ringing tone and a message on the dis-
play.
If the caller's name and number are among
the entries in the audio system's phone
book and the caller has not withheld this
information, it will appear on the display. If
the caller withholds this information, you
will see:
To accept: Press buttons on audio
control unit.
or
Press n on the audio controller.
To reject: Press buttont on audio
control unit.
or
Slideomor rotateymz the audio con-
troller to select
Reject, and press n
on the audio controller to confirm.
The call is rejected.If you have accepted the call using the au-
dio control unit, audio controller, or the
multifunction steering wheel, the call will
be conducted via the hands-free system.
The volume of the call can be adjusted
(
page 189).
Further operating functions can be found
in the “Functions during a single-call” sec-
tion (
page 240).
You can also accept a call if the audio dis-
play is showing a screen other than the
telephone mode screen. After accepting
the call, the display switches to the phone
display. Once the call is over, the display
for the previous mode will appear again.
iDepending on the mobile phone you are us-
ing, the audio system's ringing tone may differ
from the one you have set on your phone. You
may hear

the ringing tone set on the mobile phone

the audio system's preset ringing tone

the audio system's preset ringing tone and
the ringing tone set on the mobile phone.

240 Controls in detail
Audio system
Functions during a single call
Switching hands-free microphone on or
off
The menu bar changes when you make or
receive a call. Instead of the
Call Lists
menu item,
Mic Off or Mic On will appear.
To switch off: Select Mic Off.
The following message will flash up on
the display:
The microphone is off.
When the microphone is switched off
the symbol > appears in the main
area.
To switch on: Select Mic On.
The following message will flash up on
the display:
The microphone is on.
The microphone is switched on and the
symbol > disappears in the main area. Sending DTMF tones
Answering machines or other devices can
be controlled via DTMF tones, e.g. for re-
mote query functions.
To transmit individual characters:
During a call select the required char-
acters.
or
Press the corresponding button on the
audio control unit.
Every selected character is transmitted
immediately.
Transmitting a phone number of a
phone book entry as a sequence of
characters: Select
Name.
Select the desired phone book entry.
The entry is transmitted immediately as
a sequence of characters.
To switch back to call display: Select
Back.
iThis function is not possible with all mobile
phones.

295 Controls in detail
Useful features
lTele Aid*
The Tele Aid system
(Tele
matic Alarm Identification on De-
mand)
The Tele Aid system consists of three
types of response:

automatic and manual emergency

Roadside Assistance, and

informationThe Tele Aid system is operational provid-
ing that the vehicle’s battery is charged,
properly connected, not damaged and
telephone phone and GPS coverage are
available.
The speaker volume of a Tele Aid call can
be adjusted when using the volume control
on the multifunction steering wheel. To
raise, press buttonæ and to lower,
press buttonç or use the audio system
rotary control button (
page 189).
To activate, press the SOS button, the
Roadside Assistance button*b or
the Information button*}, depend-
ing on the type of response required.
Shortly after the completion of your
Tele Aid acquaintance call, you will receive
a user ID and password. By visiting
www.mbusa.com and selecting “Tele Aid”
(USA only), you will have access to account
information, remote door unlock and
more.
!The initial activation of the Tele Aid system
may only be performed by completing the sub-
scriber agreement and placing an acquaintance
call using the Information button*}. Failure
to complete either of these steps will result in a
system that is not activated.
If you have any questions regarding activation,
please call the Response Center at
1-800-756-9018 (in the USA) or
1-888-923-8367 (in Canada).
iThe Tele Aid system utilizes the telephone
network for communication and the GPS (Global
Positioning System) satellites for vehicle loca-
tion. If either of these signals are unavailable, the
Tele Aid system may not function and if this oc-
curs, assistance must be summoned by other
means.
iThe SOS button, the Roadside Assistance
button*b, and the Information
button*} are located in the overhead con-
trol panel (
page 31).

296 Controls in detail
Useful features
System self-check
Initially, after switching on the ignition,
malfunctions are detected and indicated.
If a malfunction is detected, the indicator
lamps in the SOS button, the Roadside As-
sistance button*b and the Information
button*} stay on longer than
10 seconds or do not come on. The mes-
sage
Tele Aid not activated or Tele Aid
inoperative
appears in the multifunction
display.Emergency calls
An emergency call is initiated
automatically following an accident in
which the emergency tensioning devices
(ETDs) or air bags deploy.
An emergency call can also be initiated
manually by opening the cover next to the
interior rear view mirror labeled SOS, then
briefly pressing the button located under
the cover. For instructions on initiating an
emergency call manually (
page 298).
Once the emergency call is in progress, the
indicator lamp in the SOS button will begin
to flash. The message:

Connecting call appears in the multi-
function display
and the audio system is muted. When the
connection is established, the message:

Call connected appears in the multi-
function display
Warning!G
If the indicator lamps in the SOS button, in
the Roadside Assistance button*b
and/or in the Information button*}do
not come on during the system self-check,
or if any of these indicators remain illuminat-
ed continuously in red and/or the message
Tele Aid not activated or Tele Aid
inoperative
is displayed in the multifunc-
tion display after the system self-check, a
malfunction in the system has been detect-
ed.
If a malfunction is indicated as outlined
above, the system may not operate as ex-
pected. Have the system checked at the
nearest Mercedes-Benz Center as soon as
possible.

297 Controls in detail
Useful features
All information relevant to the emergency,
such as the location of the vehicle (deter-
mined by the GPS satellite location sys-
tem), vehicle model, identification number
and color are generated.
A voice connection between the Response
Center and the occupants of the vehicle
will be established automatically soon af-
ter the emergency call has been initiated.
The Response Center will attempt to deter-
mine more precisely the nature of the acci-
dent provided they can speak to an
occupant of the vehicle.The Tele Aid system is available if

it has been activated and is operation-
al. Activation requires a subscription
for monitoring services, connection,
and cellular air time

the relevant cellular phone network
and GPS signals are available and pass
the information on to the Response
Center

there is sufficient voltage in the vehicle
batteries
iDuring the emergency call message Emer-
gency Call Activated
is displayed, opera-
tion from audio system or COMAND* is not
possible. The automatic climate control can be
still adjusted using the switches on the climate
control panel.
iIf no vehicle occupant responds, an ambu-
lance will be sent to the vehicle immediately.
iLocation of the vehicle on a map is only pos-
sible if the vehicle is able to receive signals from
the GPS satellite network and pass the informa-
tion on to the Response Center.
Warning!G
If the indicator lamp in the SOS button is
flashing continuously and there was no
voice connection to the Response Center
established, then the Tele Aid system could
not initiate an emergency call (e.g. the rele-
vant telephone network is not available).
The message
Call failed appears in the
multifunction display for approximately
10 seconds.
Should this occur, assistance must be sum-
moned by other means.
iDuring the emergency call the telephone is
switched off automatically and must be switched
back on to make a call.
iThe “911” emergency call system is a public
service. Using it without due cause is a criminal
offense.

299 Controls in detail
Useful features
Roadside Assistance button*b
The Roadside Assistance buttonb is
located in the overhead control panel.
1Roadside Assistance buttonb
Press and hold Roadside Assistance
button b (for longer than
2 seconds).
A call to a Mercedes-Benz Roadside As-
sistance dispatcher will be initiated.
The button will flash while the call is in
progress. The message:

Connecting call appears in the
multifunction display
and the audio system is muted.When the connection is established, the
message:

Call connected appears in the multi-
function display
The Tele Aid system will transmit data gen-
erating the vehicle identification number,
model, color and location (subject to avail-
ability of cellular and GPS signals).
A voice connection between the Roadside
Assistance dispatcher and the occupants
of the vehicle will be established.
Describe the nature of the need for as-
sistance.
The Mercedes-Benz Roadside Assistance
dispatcher will either dispatch a qualified
Mercedes-Benz technician or arrange to
tow your vehicle to the nearest authorized
Mercedes-Benz Center. For services such
as labor and/or towing, charges may ap-
ply. Refer to the Roadside Assistance Man-
ual for more information.
These programs are only available in the
USA:

Sign and Drive services: Services such
as jump start, a few gallons of fuel or
the replacement of a flat tire with the
vehicle spare tire are obtainable.
iThe indicator lamp in the Roadside Assis-
tance buttonb remains illuminated in red for
approximately 10 seconds during the system
self-check after switching on the ignition (togeth-
er with the SOS button and the Information
button*}).
See system self-check (
page 296) if the indi-
cator lamp does not come on in red or stays on
longer than approximately 10 seconds.
If the indicator lamp in the Roadside Assistance
buttonb is flashing continuously and no
voice connection to the Response Center was
established, the Tele Aid system could not ini-
tiate a Roadside Assistance call (e.g. the relevant
telephone network is not available). The mes-
sage:

Call failed appears in the multifunction
display for approximately 10 seconds
Roadside Assistance calls can be terminated us-
ing the t button on the multifunction steer-
ing wheel or the respective button for ending a
telephone call on the audio system or the
COMAND* head unit.