Toyota 2008 Camry Owner's Manual page 268

Automatic adjustment of volume
n
When vehicle speed is 50 mph (80 km/h) or more, the volume automatically
increases. The volume returns to the previous volume setting when vehicle
speed drops to 43 mph (70 km/h) or less.
When using a voice command
n
For numbers, say a combination of single digits from zero to nine, # (pound),
∗ (star), and + (plus).
Say a command correctly and clearly.
The system may not recognize your voice in the following situations:
n
When driving on a rough road
l
When driving at high speeds
l
When air is blowing out of the vents onto the microphone
l
l When the air conditioning fan emits a loud noise
The following cannot be performed while driving:
n
l Operating the system with
Registering a cellular phone to the system
l
Changing the passkey
n
→P. 251
3-3. Using the hands-free phone system (for cellular phone)
3
243