Platform SDK: TAPI |
The lineSetupTransfer function initiates a transfer of the call specified by the hCall parameter. It establishes a consultation call, lphConsultCall, on which the party can be dialed that can become the destination of the transfer. The application acquires owner privilege to the lphConsultCall parameter.
LONG WINAPI lineSetupTransfer( HCALL hCall, LPHCALL lphConsultCall, LPLINECALLPARAMS const lpCallParams );
This transfer procedure may not be valid for some line devices. The application may need to ignore the new consultation call and unhold an existing held call (using lineUnhold) to identify the destination of the transfer. On switches that support cross-address call transfer, the consultation call can exist on a different address than the call to be transferred. It may also be necessary that the consultation call be set up as an entirely new call, by lineMakeCall, to the destination of the transfer. Which forms of transfer are available are specified in the call's address capabilities.
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. Possible return values are:
LINEERR_BEARERMODEUNAVAIL, LINEERR_INVALRATE, LINEERR_CALLUNAVAIL, LINEERR_NOMEM, LINEERR_INUSE, LINEERR_NOTOWNER, LINEERR_INVALADDRESSMODE, LINEERR_OPERATIONFAILED, LINEERR_INVALBEARERMODE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLHANDLE, LINEERR_RATEUNAVAIL, LINEERR_INVALCALLPARAMS, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALCALLSTATE, LINEERR_STRUCTURETOOSMALL, LINEERR_INVALLINESTATE, LINEERR_UNINITIALIZED, LINEERR_INVALMEDIAMODE, LINEERR_USERUSERINFOTOOBIG, LINEERR_INVALPOINTER.
The lineSetupTransfer function sets up the transfer of the call specified by hCall. The setup phase of a transfer establishes a consultation call that enables the application to send the address of the destination (the party to be transferred to) to the switch, while the call to be transferred is kept on hold. This new call is referred to as a consultation call (hConsultCall) and can be dropped or otherwise manipulated independently of the original call.
When the consultation call has reached the dialtone call state, the application can proceed transferring the call either by dialing the destination address and tracking its progress, or by unholding an existing call. The transfer of the original call to the selected destination is completed using lineCompleteTransfer.
While the consultation call exists, the original call typically transitions to the onholdPendingTransfer state. The application may be able to toggle between the consultation call and the original call by using lineSwapHold. A consultation call can be canceled by invoking lineDrop on it. After dropping a consultation call, the original call typically transitions back to the connected state. If the call state of the original call is onHoldPendingTransfer, the lineUnhold function can be used to recover the call. In this case, the call state of the consultation call is set to idle.
The application can also transfer calls in a single step, without having to deal with the intervening consultation call, by using lineBlindTransfer.
Windows NT/2000: Requires Windows NT 4.0 SP3 or later.
Windows 95/98: Requires Windows 95 or later.
Version: Requires TAPI 1.3 or later.
Header: Declared in Tapi.h.
Library: Use Tapi32.lib.
Unicode: Implemented as Unicode and ANSI versions on all platforms.
Transfer Overview, TAPI 2.2 Reference Overview, Supplementary Line Service Functions, LINE_REPLY, lineBlindTransfer, lineCompleteTransfer, lineDial, lineDrop, lineMakeCall, lineSwapHold, lineUnhold