// ksmedia.h

typedef enum {
  TELEPHONY_CALLSTATE_DISABLED,
  TELEPHONY_CALLSTATE_ENABLED,
  TELEPHONY_CALLSTATE_HOLD,
  TELEPHONY_CALLSTATE_PROVIDERTRANSITION
} TELEPHONY_CALLSTATE;
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Windows Driver Kit DDI reference (ne-ksmedia-telephony_callstate)

TELEPHONY_CALLSTATE enumeration

Description

The TELEPHONY_CALLSTATE enumeration defines constants that specify the state of a phone call.

Constants

`TELEPHONY_CALLSTATE_DISABLED`

Specifies that the phone call is disabled.

`TELEPHONY_CALLSTATE_ENABLED`

Specifies that the phone call is enabled. This constant is set in a number of situations. For example, it will be set by the audio driver when the provider change operation is TELEPHONY_PROVIDERCHANGEOP_END and when TELEPHONY_CALLCONTROLOP_ENABLE is received.

`TELEPHONY_CALLSTATE_HOLD`

Specifies that the phone call is on hold.

`TELEPHONY_CALLSTATE_PROVIDERTRANSITION`

Specifies that the phone call is disabled. This constant is set by the audio driver when the provider change operation is TELEPHONY_PROVIDERCHANGEOP_BEGIN.

TELEPHONY_CALLSTATE - NtDoc