ZTE Corporation ZTE Corporation ZTE Corporation ZTE Corporation The p2p technology is data centric. Data objects are distributed in the p2p overlay according to routing algorithm.Applications access the data objects via peer/client protocol or gateways, some of which need data replicas to be synchronized in real time. This can be achieved by introducing a Subscribe/Notify mechanism to p2psip. This document describes the Subscribe/Notify mechanism extension for p2psip, and also defines several new methods as needed.