Cortelco 8012 - Manual (Page 16)

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Dial/Speaker Key - Used to place or answer a call. If pressed during
a call, activates the speakerphone.
End Key - End a call. If pressed and held, powers off the handset
Left/Right Soft Key - Performs the function indicated by the text
immediately over it in the display.
*Key - Press and hold to lock the keypad. Set up a conference call
as described on Page 35.
Key Descriptions