KSTELEPHONY_PROVIDERCHANGE structure (ksmedia.h)

The KSTELEPHONY_PROVIDERCHANGE structure specifies the phone call type and provider change operation to use for the KSPROPERTY_TELEPHONY_PROVIDERCHANGE property.

Syntax

typedef struct _tagKSTELEPHONY_PROVIDERCHANGE {
  TELEPHONY_CALLTYPE         CallType;
  TELEPHONY_PROVIDERCHANGEOP ProviderChangeOp;
} KSTELEPHONY_PROVIDERCHANGE, *PKSTELEPHONY_PROVIDERCHANGE;

Members

CallType

Specifies the type of phone call (circuit-switched, LTE packet-switched, or WLAN packet-switched).

ProviderChangeOp

Specifies the change operation requested by the provider (begin, end, or cancel).

Remarks

The audio stack uses the KSTELEPHONY_PROVIDERCHANGE property to indicate the start and the end of SRVCC to the audio driver. This property communicates the call type (LTE packet-switched, WLAN packet-switched, or circuit-switched) and the provider change operation (begin, end, or cancel) to driver. The call type is ignored when the provider operation is for ending the SRVCC.

When the provider change operation is TELEPHONY_PROVIDERCHANGEOP_BEGIN, the driver updates that provider’s call state to TELEPHONY_CALLSTATE_PROVIDERTRANSITION. When the provider change operation is TELEPHONY_PROVIDERCHANGEOP_END, the driver updates that provider’s call state to TELEPHONY_CALLSTATE_ENABLED. During SRVCC, the driver must continue to use the associated KSNODETYPE_TELEPHONY_BIDI endpoint, and it does not change the jack states of this endpoint. When the provider change operation is TELEPHONY_PROVIDERCHANGEOP_CANCEL, SRVCC is being canceled, and the driver should revert back to a pre-SRVCC call.

Requirements

Requirement	Value
Minimum supported client	Windows 10,Windows 10 Mobile
Minimum supported server	Windows Server 2016
Header	ksmedia.h