1. November 2005IETF 641 Interconnect SIP networks using P2P SIP Marc Bailly marc1.bailly@francetelecom.com

2. November 2005IETF 642 Interconnection using P2P SIP Use case of P2P SIP technology One way to interconnect (not the only one) Hierarchical architecture concept

3. November 2005IETF 643 Hierarchical P2P Proposed in section 6.4.1 of Singh's and Henning's paper Why not use some specific principles such as those proposed in paper "Hierarchical P2P systems" : –In the top-level overlay network, each "node" is a set of peers. Require adaptations to Chord (for example) to manage groups instead of nodes Super peers of each group may fail independently

4. November 2005IETF 644 Interconnection using P2P SIP Domain1.com Domain2.com A B C D

5. November 2005IETF 645 Example User A in domain1.com wants to join a B in domain2.com: –Local lookup service of domain1 is used to locate one of the peers of the local domain which belongs to the top level DHT (node C), –Signalization is proxied to one of the gateway node of domain2.com (node D). This node is located thanks to the top level DHT lookup mechanism, –This node D uses the local lookup service of the callee's network (domain2.com) to locate the callee.

6. November 2005IETF 646 Top level DHT Used for inter-domains routing Two main approaches for routing: –The set of nodes responsible for a domain joins this DHT with a random ID and register their domain on KeyID = HASH(domain.com) –The set of nodes responsible for a domain joins this DHT with the ID = HASH(domain.com) We would prefer the second approach: –Takes heterogeneity of domains size into account Maybe extend this model with several levels in the P2P SIP DHT.

7. November 2005IETF 647 Advantages offers standardized interconnection to isolated islands in a P2P way does not prevent from using optimized P2P layer protocol (in a specific environment : mobile or wifi network) does not prevent from using P2P SIP in a domain does not prevent from connecting centralized networks enables to have ad-hoc realms (eventually just one UA)

8. November 2005IETF 648 What's next? Are people interested in this ? Comments/Discussion ?

9. November 2005IETF 649 References SIPPEER: A Session Initiation Protocol (SIP)-based Peer-to-Peer Internet Telephony Client Adaptor, Kundan Singh and Henning Schulzrinne Hierarchical P2P Systems, L. Garcés-Erice, E. W. Biersack, P. A. Felber, K. W. Ross and G. Urvoy-Keller A Dependable Global Location Service using Rendezvous on Hierarchic Distributed Hash Tables, J. Risson, T. Moors and A. Harwood