C456HD Front View

The front view of the phone is shown in the figure and described in the table.

C456HD Front View

C456HD Front View Description

Item #

Label/Name

Description
1

Ring LED

Indicates phone status:

■ Green: Idle state
■ Flashing red: Incoming call (ringing)
■ Red: Answered call
2

TFT touch screen

Thin Film Transistor touch screen, a type of LCD (Liquid Crystal Display) interactive screen which displays information and lets you configure features by touch.
3

Navigation Control / OK
■ Press the button's upper rim to scroll up menus/items.
■ Press the lower rim to scroll down.
■ Press the left or right rim to move the cursor left|right (e.g., when editing a contact number).
■ Press OK to select a menu/item/option.
4

Voicemail

Retrieves voicemail messages.

5

CONTACTS

Accesses the People screen.
6

MENU

Accesses the Settings screen.

7

Smart Button

By default, returns you to the home (idle) screen from any screen.

Can be configured to function as a redial button (see Enable the AudioCodes Smart Button for Redial Functionality).
8

TRANSFER

Transfers a call.
9

Kensington lock

Allows locking the device.
10

HOLD

Places an active call on hold.
11

Alphanumerical Keypad

Keys for entering numbers, alphabetical letters and symbols (e.g., colons).
12

Microphone*

Allows talking and listening. The network administrator can disable it if required.
13

Speaker*

Activates the speaker, allowing a hands-free conversation.
14

Headset

Activates a call using an external headset.
15

Mute

Mutes a  call.

16
17

+

Increases or decreases the volume of the handset, headset, speaker, ring tone and call progress tones.

-

18

'Back' key

Returns you to the previous screen.

19

Action button

Makes a 911 call (to be implemented)

*If your phone supports hardware mute (applies to devices with DBW - THM), the handset must be off-hook for the speaker and microphone to work.
● Differences exist between C456HD non-DBW and C456HD DBW.
● Both C456HD DBW and C456HD non DBW feature an optional Gen-2 expansion unit (not included in the preceding figure).