TAPI的问题，lineMakeCall 执行后得不到 HCALL 得到的HCALL 的地址为0，代码如下，请高手帮忙

[gwaresoft]

long status=0;

status=lineInitialize(&lineapp,::AfxGetInstanceHandle(),
(LINECALLBACK)LineCallbackProc,"TAPI",&lpdwNumdevs);

lineOpen(lineapp,0,&hline,0x10004,0,0,
LINECALLPRIVILEGE_OWNER,LINEMEDIAMODE_DATAMODEM,NULL);


para.dwBearerMode=LINEBEARERMODE_VOICE;
para.dwMediaMode=LINEMEDIAMODE_DATAMODEM;
para.dwTotalSize=sizeof(LINECALLPARAMS);


status=lineMakeCall(hline,&hcall,"13060087865",0,¶);

执行完最后一句后，电话已经接通，已经正常通话，但是hcall的地址全部为0，
请高手帮忙解释解释