C / C++ / MFC

void WINAPI TapiInitialize() {

	LPLINEDEVCAPS lineDevCaps = NULL;
	lineDevCaps = (LPLINEDEVCAPS)LocalAlloc(LPTR, 4096);
	
	//create the event first..
	EventReply = CreateEvent(NULL,FALSE,FALSE,NULL);

	//clear the structure before the usage
	memset(&LineInitializeExParams,0,sizeof(LINEINITIALIZEEXPARAMS));

	//populate the options
	LineInitializeExParams.dwTotalSize = sizeof(LINEINITIALIZEEXPARAMS);
	LineInitializeExParams.dwOptions = LINEINITIALIZEEXOPTION_USEEVENT;

	//call the LineInitializeEx function
	result = lineInitializeEx(&lineApp,NULL,(LINECALLBACK)&lineCallbackFunc,NULL,&numDevs,&tapiVersion,&LineInitializeExParams);
	if (result!=0)	
		printf("TAPI could't be Initialized"); 
	else printf("\n\nTAPI Initialized..");

	num = numDevs;
	printf("\nNumber of lines available to this app:  %d",(LPWSTR)num);

	result = lineNegotiateAPIVersion(lineApp,0,API_EARLY_VERSION,API_CURRENT_VERSION,&tapiVersion,0);
	result = lineGetDevCaps(lineApp,0,tapiVersion,0,lineDevCaps);
	//opening a line
	result = lineOpen(lineApp,0,&hLine,tapiVersion,0,0,LINECALLPRIVILEGE_MONITOR,LINEMEDIAMODE_DATAMODEM,NULL);
	if(result!=0)
		printf("\nLINE could't be Opened...");
	else
		printf("\nLINE Opened...");

void WINAPI TapiShutdown() {
	result = lineShutdown(lineApp);
	if (result==0)
		printf("Line closed successfuly");
	else 
		printf("something went wrong"); 
}

VOID FAR PASCAL lineCallbackFunc(DWORD hDevice,DWORD dwMsg, DWORD Param1, DWORD Param2, DWORD Param3) {
	if (dwMsg == LINE_REQUEST) 
		printf("incomg line...");
}

int _tmain(int argc, _TCHAR* argv[])
{
	TapiInitialize();
	Sleep(180000);
	printf("\n\nPress any key to close line....");
	getche();
	TapiShutdown();
	return 0;
}

"The application failed to initialize properly (0xc0150002).click on OK to terminate the application"