Mercedes-Benz 2009 CL-Class Operator's Manual page 286

Control systems
Voice Control troubleshooting
Entering digits and spelling
Entering digits
Digits from "Zero" to "Nine" may be used.
R
Speaking phone numbers in digit blocks of
R
3 to 5 digits has proven a very reliable
method for the input of phone numbers.
What to do if ...
Problem
Voice Control System does not recognize a
station list entry.
284
Spelling
The letters of the English alphabet and the
R
digits 0 - 9 may be used.
Speak the letters in blocks of 5 - 7 letters
R
at a time.
Speak each individual letter clearly.
R
Possible cause/consequence
The voice entries for the station names sound
too similar.
Suggested solution
X
When you create your address book
entries, select names with the greatest
possible acoustic differences.
X
Speak the command "List station list".
The system reads out the station list entry
by entry.
X
Press ! when the desired station name
is being read out.
The station is selected ( Y page 268).