XPP Extensions for Implementing a Passive P2PSIP Overlay Network based on the CAN Distributed Hash Table

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Last updated 2007-11-16
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document defines a set of extensions for the Extensible Peer Protocol (XPP) required for creating a P2PSIP overlay network based on the CAN distributed hash table algorithm. It specifies how peers and clients must behave in order to maintain the overlay and use it for the establishment of multimedia communication sessions. To limit the overhead due to maintenance operations and to allow the adoption of security policies for preventing malicious nodes to damage the overlay, joins are always initiated and controlled by existing peers (hence the passive in PCAN).


Enrico Marocco (enrico.marocco@telecomitalia.it)
Emil Ivov (emcho@sip-communicator.org)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)