lineSwapHold function (tapi.h)
The lineSwapHold function swaps the specified active call with the specified call on consultation hold.
Syntax
LONG lineSwapHold(
HCALL hActiveCall,
HCALL hHeldCall
);
Parameters
hActiveCall
Handle to the active call. The application must be an owner of the call. The call state of hActiveCall must be connected.
hHeldCall
Handle to the consultation call. The application must be an owner of the call. The call state of hHeldCall can be onHoldPendingTransfer, onHoldPendingConference, or onHold.
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. Possible return values are:
LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSTATE, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL, LINEERR_NOTOWNER, LINEERR_UNINITIALIZED.
Remarks
Swapping the active call with the call on consultation hold allows the application to alternate or toggle between these two calls. This is typical in call waiting.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | tapi.h |
| Library | Tapi32.lib |
| DLL | Tapi32.dll |