Interconnect SIP networks
using P2P SIP
Marc Bailly
[email protected]
November 2005
IETF 64
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Interconnection using P2P SIP
• Use case of P2P SIP technology
• One way to interconnect (not the only one)
• Hierarchical architecture concept
November 2005
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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
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Interconnection using P2P SIP
Domain1.com
A
D
C
Domain2.com
B
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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.
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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.
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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)
November 2005
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What's next?
• Are people interested in this ?
• Comments/Discussion ?
November 2005
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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
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