Peer2Peer SIP
SIP without servers - peer 2 peer
From the IETF Working group charter:
The Peer-to-Peer (P2P) Session Initiation Protocol working group (P2PSIP WG) is chartered to develop protocols and mechanisms for the use of the Session Initiation Protocol (SIP) in settings where the service of establishing and managing sessions is principally handled by a collection of intelligent endpoints, rather than centralized servers as in SIP as currently deployed. A number of cases where such an architecture is desirable have been documented.The work focuses on collections of nodes called “P2PSIP peers” and ”P2PSIP clients”. P2PSIP peers manifest a distributed namespace in which overlay users are identified and provides mechanisms for locating users or resources within the P2PSIP overlay.P2PSIP clients differ from P2PSIP peers primarily in that they do not store information in the overlay, but only use it to locate users and resources. P2PSIP clients and peers use the resolution services of the peers as an alternative to the SIP discovery process of RFC 3263. In this way, P2PSIP offers an alternative mechanism for determining the correct destination for SIP requests. The working group’s initial charter scope will be to produce protocols to enable this alternate mechanism for RFC 3263 functionality. Session management, messaging, and presence functions are performed using conventional SIP.
The draft about application scenarios describes one application, a global p2pSIP realtime application network:
4.1.2. Open Global P2P VoIP NetworkThis is a global P2P VoIP network in which there is no central authority such as a single service provider. Anyone can join and leave the network freely and anyone can implement the software to participate in the overlay network. In such a system, the protocols used must be based on open standards. This P2P VoIP network resembles the global Internet itself in that it has distributed management and growth, enables anyone to reach anyone else in the overlay network, and any device supporting the standard protocols can be used.
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November 15th 2007
