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28 MBU 400 Installation Guide
Using the MBU 400
Using the Volume Control
The volume control is located on the left side of the phone. You can
increase or decrease the volume while on an active call as required.
To adjust the volume on the phone:
1. Press the + key to increase the volume as required.
2. Press the - key to decrease the volume as required.
Using the Speakerphone
The speakerphone control is located on the left side of the phone beneath
the volume control. You can use the speakerphone key before or during an
active call to turn the speakerphone on and off.
To turn the speakerphone on and off:
1. Press the speakerphone key to turn the speakerphone on.
2. Press the speakerphone key again to turn the speakerphone off.
Locking/Unlocking the Keypad
You can lock and unlock the keypad on the phone when required. When
locked, it prevents unauthorized users from using your phone, and prevents
you from accidently hitting the keypad if you are carrying the phone
around.
To lock the keypad:
1. In Idle Mode, press the “*” key.
2. Press the “Lock” softkey.
To unlock the keypad:
1. To unlock the keypad, press the “*” key.
2. Press the “Unlock” softkey.
Note: The keypad unlocks automatically when you answer an incoming
call, or if you make an emergency call. For more information
about emergency calls, see the MBU 400 User Guide.
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