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MBU 400 Installation Guide 7
Aastra 420d Handset - Front View
MBU 400 Hardware
The MBU 400 consists of an MBU and the Aastra 420d Handset. The
following illustrations describe the ports, indicators, and keys on the MBU
400 hardware.
Aastra 420d Handset - Front View
COLOR DISPLAY
EARPIECE
SOFTKEYS
used for various
functions
NAVIGATIONAL KEYS
used to navigate through
menus and services
MICROPHONE
STAR KEY
used in the name editor to
capitalize letters, type num-
bers, or enter a star symbol
KEYPAD
used to enter numbers
and letters
OK KEY
used to enter the
main menu and
select and
conrm options
RED KEY
used to hang up
or leave a menu
and to turn the
handset on or off
GREEN KEY
used to make calls on
primary line or
answer calls