SIPNet is a p2p-sip framework, it support IM,audio,video based on p2p-sip protocols, and support file sharing like other p2p programs such as bittorrent. All SIPNet clients join to form a P2P overlay net and find each other using DHT algorithm.
FriendShare was a private and anonymous overlay "friend to friend" P2P based on Napshare. Now we recommend the use of the following F2F P2P: GNUnet, freenet, oneswarm, turtle . Please see https://secure.wikimedia.org/wikipedia/en/wiki/Friend-to-friend