Voice over IP (VoIP) and Instant Messaging (IM) systems to date have
either followed a client-server model or have required the use of
clients that do not follow any VoIP or IM standard. We present
SOSIMPLE---a fully decentralized, P2P, standards-based approach to
communications. By building on the existing SIP/SIMPLE infrastructure
for VoIP and IM, we support reuse of clients, network infrastructure,
and open-source protocol stacks designed using current standards.  By
avoiding traditional centralized architectures, SOSIMPLE addresses
corporate privacy concerns, eliminates dependency on constant Internet
connectivity, and supports ad hoc groups.  SOSIMPLE implements a DHT
overlay based on Chord using SIP messages, replicating location
information for reliability.  The DHT is used only for lookups, with
actual communication passing directly between clients.  We discuss
important issues for security and authentication, as well as
adaptations of conventional P2P routing for the social networks
typical of personal communications.  We are testing a prototype
implementation of SOSIMPLE and anticipate a public release in the near
future.


@InProceedings{sosimple-aaa-idea-2005,
  author = 	 {David A. Bryan and Bruce B. Lowekamp and Cullen Jennings},
  title = 	 {{SOSIMPLE}: A Serverless, Standards-based, 
{P2P SIP} Communication System},
  booktitle = 	 {Proceedings of the 2005 
International Workshop on Advanced Architectures and Algorithms for 
Internet Delivery and Applications (AAA-IDEA 2005)},
  year =	 2005,
  month =	 {June}
}