The PHONEHOOKSWITCHMODE_ bit-flag constants describe the microphone and
speaker components of a hookswitch device.
The device's microphone and speaker are both onhook.
The device's microphone is active, the speaker is mute.
The device's speaker is active, the microphone is mute.
The device's microphone and speaker are both active.
The device's hookswitch mode is currently unknown.
No extensibility. All 32 bits are reserved.
These constants are used to provide an individual level of control over the
microphone and speaker components of a phone device.
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