Research And Implementation Of EIM Based On SIP

With the development of network technology, Instant Messaging (IM) has been a requirement of on-line activities. And now the research hotspots in the Instant Messaging field have changed from Personal Instant Messaging (PIM) to Enterprise Instant Messaging (EIM).The traditional EIM systems are mainly used to deal with Local area network, and its simple signaling system is hardly qualified for an across-area enterprise network. In order to solve the problem, there has called for a new media session signaling, where SIP protocol has been a focus of attention for its concision, scalablity and event-handling virtues. The Session Initiation Protocol (SIP) is a generic application layer session management protocol, which main purpose is to initiate, modify and terminate sessions between two (or more) Internet end entities, developed by Inernet Engineering Task Force (IETF).So this paper's target is the implementation of EIM based on SIP. This paper mainly describes the EIM's simulation research and system design based on SIP protocol. First a future IM architecture based on SIP is introduced followed with the outline of IM and SIP characteristics.Then based on an actual enterprise network status, the optimal distribution and number of signaling servers, aided by OPNET Modeler simulation tool, has been presented along with the simulation results obtained, which shows that only setting one central signaling server in the actual EIM system can achieve high cost/performace ratio. Last, the paper explicates the design of client and server modules based on"event-driven" mechanism, and the establishment of EIM system based on Browser/Server (B/S) architecture.And the implementation of EIM gives a strongly support to the analysis and simulation of SIP.