PHONEBUTTONSTATE_ Constants

The PHONEBUTTONSTATE_ bit-flag constants describe the button's positions.

PHONEBUTTONSTATE_DOWN

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

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)

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)

PHONEBUTTONSTATE_UP

The button is in the "up" state.

No extensibility. All 32 bits are reserved.

For backward compatibility, it is the responsibility of the service provider to examine the negotiated API version on the phone, and to not use those PHONEBUTTONSTATE_ values that the negotiated version does not support.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
  Windows 95/98: Requires Windows 95 or later.
  Version: Requires TAPI 2.0 or later.
  Header: Declared in Tapi.h.