lineCompleteTransfer (Compact 2013)

3/26/2014

This function completes the transfer of the specified call to the party connected in the consultation call.

Syntax

LONG WINAPI lineCompleteTransfer(
  HCALL hCall,
  HCALL hConsultCall,
  LPHCALL lphConfCall,
  DWORD dwTransferMode 
);

Parameters

• hCall
  Handle to the call to be transferred. The application must be an owner of this call. The call state of hCall must be onHold or onHoldPendingTransfer.

• hConsultCall
  Handle to the call that represents a connection with the destination of the transfer. The application must be an owner of this call. The call state of hConsultCall must be connected, ringback, busy, or proceeding.

• lphConfCall
  Pointer to a memory location where an hCall handle can be returned. If dwTransferMode is LINETRANSFERMODE_CONFERENCE, the newly created conference call is returned in lphConfCall and the application becomes the sole owner of the conference call. Otherwise, this parameter is ignored by TAPI.

• dwTransferMode
  Specifies how the initiated transfer request is to be resolved. This parameter uses one of the LINETRANSFERMODE constants.

Return Value

Returns a positive request identifier if the function is completed asynchronously, or a negative error number if an error occurs. The dwParam2 parameter of the corresponding LINE_REPLY message is zero if the function succeeds or it is a negative error number if an error occurs. The following table shows the return values for this function.

Value	Description
LINEERR_INVALCALLHANDLE	The handle to the call to be transferred is invalid.
LINEERR_NOTOWNER	The application is not the owner of this call.
LINEERR_INVALCALLSTATE	The call state of hCall is not onHold or onHoldPendingTransfer.
LINEERR_INVALCONSULTCALLHANDLE	The handle to the call that represents a connection with the destination of the transfer.
LINEERR_OPERATIONFAILED	The operation failed.
LINEERR_OPERATIONUNAVAIL	The operation is unavailable because this function is not supported by code division multiple access (CDMA). CDMA does not provide the necessary functionality to support the following TAPI functions: lineAccept lineAnswer lineClose lineCompleteTransfer lineDial lineDrop lineHold lineMakeCall linePark linePickup lineSwapHold Some cellular carriers provide equivalent functionality through the flash feature, which with TAPI 2.2 can be accessed with the lineGenerateDigits function. Because the exact flash sequences are controlled by the cellular providers, the application must be completely aware of the necessary codes implemented by the cellular providers.
LINEERR_INVALTRANSFERMODE	The transfer mode is invalid.
LINEERR_RESOURCEUNAVAIL	The resources are unavailable.
LINEERR_INVALPOINTER	The pointer is invalid.
LINEERR_UNINITIALIZED	A parameter is uninitialized.
LINEERR_NOMEM	Not enough memory is available.

Remarks

The LINE_REPLY message sent in response to a call to the lineCompleteTransfer function is based on the status of the call specified by the hCall parameter.

This operation completes the transfer of the original call, hCall, to the party currently connected by hConsultCall. The consultation call is typically dialed on the consultation call allocated as part of the lineSetupTransfer function, but it can be any call to which the switch is capable of transferring hCall.

The transfer request can be resolved either as a transfer or as a three-way conference call. When resolved as a transfer, the parties connected by hCall and hConsultCall are connected to each other, and both hCall and hConsultCall are typically cleared from the application's line and transition to the idle state. The application's call handle remains valid after the transfer has completed. The application must deallocate its handle with the lineDeallocateCall function.

When resolved as a conference, all three parties enter into a conference call. Both existing call handles remain valid but transition to the conferenced state. A conference call handle is created and returned, and it transitions to the connected state.

If the lineGetConfRelatedCalls function is called immediately after lineCompleteTransfer with the result that the calls are conferenced, lineGetConfRelatedCalls may not return a complete list of related calls. This is because TAPI waits to receive a LINE_CALLSTATE message indicating that the call has entered LINECALLSTATE_CONFERENCED before it considers the call to actually be part of the conference. That is, it waits for the service provider to confirm the conferenced state. After the application has received the LINE_CALLSTATE message, lineGetConfRelatedCalls returns complete information.

It can also be possible to perform a blind transfer of a call using lineBlindTransfer.

Requirements

Header	tapi.h
Library	TAPI32.dll

See Also

Reference

TAPI Line Device Functions
lineBlindTransfer
lineDeallocateCall
lineGetConfRelatedCalls
lineSetupTransfer
LINE_CALLSTATE (TAPI)
LINE_REPLY