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Peer-to-Peer SIP Features to Eliminate a SIP Sign-Up Process

We propose two features for peer-to-peer SIP in order to eliminate a sign-up process so that users can use the SIP user agent software right after installation. One is a locally generated SIP-URI which eliminates the sign-up process. Another is a feature to exchange contact addresses. It helps users to create new entries in the local address book without typing SIP-URIs. We implemented these features on SIP-Communicator with a peer-to-peer client protocol to work with a peer-to-peer SIP overlay network.