Enhancing the reliability of SIP service in large-scale P2P-SIP networks

Abstract

Recently P2P-SIP (Peer-to-Peer Session Initiation Protocol) has been proposed to improve the scalability and reliability of the traditional SIP (Session Initiation Protocol) networks. However, P2P-SIP makes SIP service unreliable because large-scale P2P-SIP networks are probably more dynamic than traditional SIP networks and the service nodes are very likely to fail or leave the P2P-SIP networks. To deal with this issue, we propose a novel and lightweight algorithm, which replicates SIP transactions information among the nodes in P2P-SIP networks and selects one of the successors of the failed or departed node as the takeover server. Moreover, to reduce the retrieving delay of SIP transactions replicas, we optimize our algorithm by storing these replicas directly in the successors of the failed or departed node. The simulation results demonstrate that our algorithm maintains 99% dialogs correctly in the presence of nodes failure with acceptable overheads over the Internet. © 2011 Springer-Verlag.