// ksmedia.h

typedef enum {
  TELEPHONY_PROVIDERCHANGEOP_END,
  TELEPHONY_PROVIDERCHANGEOP_BEGIN,
  TELEPHONY_PROVIDERCHANGEOP_CANCEL
} TELEPHONY_PROVIDERCHANGEOP;
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Windows Driver Kit DDI reference (ne-ksmedia-telephony_providerchangeop)

TELEPHONY_PROVIDERCHANGEOP enumeration

Description

The TELEPHONY_PROVIDERCHANGEOP enumeration defines constants that specify the requested provider change operation.

Constants

`TELEPHONY_PROVIDERCHANGEOP_END`

Specifies that the provider change operation has ended. The audio driver will update the call state to TELEPHONY_CALLSTATE_ENABLED in response to this value.

`TELEPHONY_PROVIDERCHANGEOP_BEGIN`

Specifies that the provider change operation has begun. The audio driver will update the call state to TELEPHONY_CALLSTATE_PROVIDERTRANSITION in response to this value.

`TELEPHONY_PROVIDERCHANGEOP_CANCEL`

Specifies that single-radio voice call continuity (SRVCC) is being canceled, and that the audio driver should revert back to the pre-SRVCC state. The audio driver will update the provider call state to TELEPHONY_CALLSTATE_ENABLED in response to this value.

TELEPHONY_PROVIDERCHANGEOP - NtDoc