Extensible Peer Protocol (XPP)

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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This Internet-Draft is no longer active.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 the Extensible Peer Protocol (XPP), a lightweight binary protocol for end-to-end sessions between peers in distributed overlay networks. One of the main goals while creating this protocol was support for nodes located behind firewalls and NATs. XPP therefore uses UDP and allows endpoints to simultaneously initiate sessions. Given the choice of the underlying protocol (UDP), XPP also defines mechanisms for message fragmentation and reliability.


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.)