Polycom IP 450 : phone overview
1 : Message waiting indicator
2 : Line indicators
3 : Line/Speed dial key
4 : Arrow keys
5 : Speakerphone
6 : Feature keys
7 : Microphone mute
8 : Handsfree microphone
9 : Volume keys
10 : Dial pad
11 : Headset
12 : Hold
13 : Speaker
14 : Soft keys
15 : Graphic displays
16 : Hook switch
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