2011 Toyota Camry Owners Manual - Page 314

3-4. Using the hands-free phone system (for cellular phone) 3-spoke steering wheel Volume The voice guidance volume cannot be adjusted using this button. Off-hook switch Turns the hands-free system on/starts a call On-hook switch Turns the hands-free system off/ends a call/refuses a call Talk switch Turns the voice command system on (press)/turns the voice command system off (press and hold)