Click this link for Avaya online user guide for the 1408 & 1416 Digital Phones:
The diagram below shows the main features of a 1416 phone.

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The display angle can be adjusted for optimal viewing. |
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This phone has 16 programmable buttons. |
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The phone also supports up to 3 add-on button modules, each providing an addition 32 buttons. |
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By
default the first 3 buttons are used as appearance buttons for calls
you make and receive. Your system administrator can configure additional
appearance buttons. |
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Any
button not configured as appearance buttons can be configured for a
range of telephone system features. These are called feature buttons.
Your system administrator can do this or, for a limited number of
functions, you can do this using the phones self-administration menu. |
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The
phone includes an integral stand that can be flipped to either of two
positions without needing any tools. When used in the upright position, a
plastic peg in the earpiece rest area for the handset can be reversed
if a more secure grip on the handset when not in use is required. |
• |
The
phone includes a hands free speaker and microphone for operation as a
hands free speakerphone. The speaker is located under the handset. The
microphone is located at the bottom right of the keypad. |
•The phone includes a headset socket for connection of phone headsets.