Value (Hex)

Constant

Meaning

00000001

PHONEBUTTONSTATE_UP

The button is in the "up" state.

00000002

PHONEBUTTONSTATE_DOWN

The button is in the "down" state (pressed down).

00000004

PHONEBUTTONSTATE_UNKNOWN

Indicates that the up or down state of the button is not known at this time, but may become known at a future time. (TAPI versions 1.4 and later)

00000008

PHONEBUTTONSTATE_UNAVAIL

Indicates that the up or down state of the button is not known to the service provider, and will not become known at a future time. (TAPI versions 1.4 and later)