The PHONEHOOKSWITCHDEV_ bit-flag constants describe various audio I/O devices each with its own hookswitch controllable from the computer.


This is the ubiquitous, handheld, ear- and mouthpiece.


This is a built-in loudspeaker and microphone. This could also be an externally connected adjunct speaker to the telephone set.


This is a headset connected to the phone set.

No extensibility. All 32 bits are reserved.

These constants are used in the PHONECAPS data structure to indicate the hookswitch device capabilities of a phone device. The PHONESTATUS structure reports the state of the phone's hookswitch devices. The function phoneSetHookSwitch and phoneGetHookSwitch use it as a parameter to select the phone's I/O device.

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