EarthLink SIPshare is a simple, SIP-based proof-of-concept content sharing prgoram, demonstrates the viability of SIP as a protocol over which peer-to-peer (P2P) software other than the well-known video and voice cases may be implemented.

As a proof-of-concept application, share documents, photos, and other files with peers on the network via standard SIP messaging, and completed using a simple UDP-based file transfer protocol.

SIPshare is a Java application.