Mercedes-Benz COMAND MY06 Operator's Manual page 98

Transmitting number sequences
Answering machines or other devices
could possibly be controlled through num-
ber sequences (e.g. remote query func-
tions).
With an open connection, press one of
the appropriate number keys  - 
for each digit.
You can also transmit the
characters  and  (#).
Telephone*
Telephone operation
97