呈现业务中内容服务器的设计与实现

Presence service uses SIP as a major method to transport the presence information. But, SIP is used mainly to carry signalling information and SIP message can't carry large data. SIP messages with large data will increase the network delay, especially in wireless and mobile communication environment.This paper introduces the design and implementation of content server in Presence service based on content indirection mechanism.Content server in the Presence service is used specifically to store presence information which has large data and provide storing and retrieving facility for presence MIME objects.Using content indirection mechanism and content server, Presence service can support the function to provide presence information with large data.