PHONEBUTTONSTATE_ Constants
The PHONEBUTTONSTATE_ bit-flag constants describe the button's positions.
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PHONEBUTTONSTATE_DOWN
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The button is in the "down" state (pressed down).
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PHONEBUTTONSTATE_UNAVAIL
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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)
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PHONEBUTTONSTATE_UNKNOWN
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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)
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PHONEBUTTONSTATE_UP
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The button is in the "up" state.
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Remarks
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
| Requirement | Value |
|---|---|
| TAPI version |
Requires TAPI 2.0 or later |
| Header |
|