Aastra 9143i Series Administrator's Manual page 59

Overview
IP Phone Models
Keys Key Description
Handsfree key - Activates Handsfree for making and receiving calls without lifting
the handset. When the audio mode option is set, this key is used to switch between
a headset and the handsfree speakerphone.
Mute key - Mutes the microphone so that your caller cannot hear you (the light
indicator flashes when the microphone is on mute).
Navigation keys - Pressing the UP and DOWN arrow keys lets you view different
status and text messages on the LCD display (if there is more than 1 line of status/
text messages). These buttons also let you scroll through menu selections, such as
the Options List.
Pressing the LEFT and RIGHT arrow keys lets you view the different line/call
appearances. While in the Options List, these keys allow you to exit or enter the
current option. When you are editing entries on the display, pressing the LEFT arrow
key erases the character on the left; pressing the RIGHT arrow key sets the option.
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