Related to: TAPI Modem ActiveX Question: I can not be able to open line with: cTapi1.LineOpen(LINECALLPRIVILEGE_OWNER ,LINEMEDIAMODE_AUTOMATEDVOICE) But it open with: cTapi1.LineOpen(LINECALLPRIVILEGE_OWNER ,LINEMEDIAMODE_DATAMODEM) Answer: It seems the modem device is a data modem without the voice functionality. Please make sure the modem device supports the voice features, in other words – is a Voice Modem [...]