Polycom VVX450 Phone Diagram
This is the layout of the Polycom VVX 450 IP Phone:

1 - Line keys
Enable you to select a phone line, view calls on a line, or quickly call a favourite contact.
2 - Reversible tab
Secures the handset in the cradle when your phone stand is positioned at a high angle. To secure the handset, remove the tab, reverse it so the protrusion points up, and re-insert it. Position the handset so the protrusion on the tab fits into the slot on the handset.
3 – Speaker
Provides ringer and speakerphone audio output.
4 - Back keyÂ
Enables you to return to the previous screen.Â
5 - Transfer keyÂ
Transfers an active call to a contact.Â
6 - Messages keyÂ
Enables you to access and manage instant and voice messages.Â
7 - Hold keyÂ
Holds an active call or resumes a held call.Â
8 - Volume keysÂ
Adjust the volume of the handset, headset, speaker, and ringer.Â
9 - Dial pad
Enables you to enter numbers, letters, and special characters. You can also use the dial pad keys to select menu items that have index numbers.Â
10 - Mute key
Mutes local audio during calls and conferences.Â
11 - Speakerphone key
Enables you to place and receive calls using the speakerphone.Â
12 - Headset key
Enables you to place and receive calls through a headset.
13 -Â USB Port
Enables you to attach a USB flash drive or USB headset.Â
14 - Home key
Displays the Home screen from other screens and displays the Lines and Calls screen from the Home screen.Â
15 – Navigation keys / Select key
Scrolls through information or options displayed on the phone's screen. Selects a field of displayed data.Â
16Â - Soft keys
Enable you to select context sensitive keys that display along the bottom of the screen.Â
17 – Security slot (on back)
Enables you to attach a universal security cable lock to your phone so you can secure it to a desktop.Â
18 - Screen
Shows a 10.9 cm (4.3 in) color display with a backlight that enables you to view menu options and data.Â
19 - Message Waiting Indicator
Flashes red to indicate when you have new messages.Â