Display
The Telephony API provides access to a phone's display. The display is modeled
as an alphanumeric area with rows and columns. A phone's device capabilities
indicate the size of a phone's display as the number of rows and the number of
columns. Both these numbers are zero if the phone device does not have a
display. Use
phoneSetDisplay to write information to the display of an open phone device, and
phoneGetDisplay to retrieve the current contents of a phone's display.
When the display of a phone device is changed, a
PHONE_STATE message is sent to the application function to notify the application about
the state change. Parameters to this message provide an indication of the
change.
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