The program is used for conversation in a local network. The voice packages are transmitted in a format GSM6.10. Voice packages and service information use one and the same UDP port: 4444. The program works without Server. The ContactList traces if the client is online or offline in a network. Mixer allows to control sensitivity of a microphone and loudness of speaker. Simultaneous work with 5 clients. The sound card should be duplex. The program is distributed with the source code. P2P VoIp is licensed as freeware, full size of the download is 0.68 MB. You can download a free version of P2P VoIp by following download link at Free Downloads section of this page. P2P VoIp is developed or distributed by Ivan Sorokin.