Make FREE pc-to-pc and pc-to-phone calls over Internet and ISDN/PSTN telephone networks. PC-Telephone is a powerful communications software application that enables you to exploit the full communications potential of the Internet and public telephone networks ISDN/PSTN. PC-Telephone makes possible to use your computer as internet telephone, ISDN phone, answer phone, fax software, voicemail client and more. The Computer Telephony Integration technology (CTI) implemented in PC-Telephone increases your productivity, saves your time and money and creates many positives for companies and private individuals alike. PC-Telephone is the first software application that integrates the regular Computer Telephony and Internet Telephony (Voice over IP) in a single user interface.