Avaya NN43112-101 - Manual (Page 263)

Additional features
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Your IP Deskphone may be configured to perform automatic software
updates. If this feature is configured, the IP Deskphone displays when a
software update is scheduled to occur, and
Yes and No context-sensitive
soft keys are displayed. If the IP Deskphone is idle and no key is pressed,
the software update begins in one minute.
If you press Yes , the software download begins.
If you are using your IP Deskphone (this includes on hold, on a
conference call, or when your IP Deskphone is ringing) and you press
No ,
the call is not disconnected and the software update does not occur. The
IP Deskphone displays the software download prompt again in three
minutes a total of three times.
If, after the third notification, you press No or no key is pressed, the
software update does not occur. Your IP Deskphone attempts the
software download process again in two hours.
Note: If you allow the update to proceed and the server is down, the
IP Deskphone does not ask for updates again.