IPi Phone

There are many instant messaging clients that offer the possibility of making voice calls using the VoIP technology. However, they often do not offer a secure communication, unlike the following application. IPi Phone is a powerful instant messaging client that provides real-time text-messaging (chat) and VoIP calls. This program allows you to establish IP to IP communications without using a central server, the communication is only between the two clients.

IPi Phone features a simple and friendly interface, that might not look as good as other programs, but it offers a huge functionality. All you have to do to connect to other person, is to enter his or her IP, and then you can start talking for free. This program also uses secure communication and voice modification to protect your privacy. IPi Phone can encrypt communications with AES that uses a 160 bit key length.