企业网的IMS接入与业务方案研究

s technology develops, the enterprise customers’ demand of telecommunication service changes gradually from the traditional voice-based service to broadband service based on IP, such as video calls, multimedia conference, etc. Using the traditional circuit switch technology can no more satisfy the various demands of the enterprise customers. But IMS which is based on IP can handle this problem very well. There are many different ways and devices of various advantages and disadvantages to connect the enterprise network to IMS. This paper will compare these different access ways and devices to give a conclusion that under which condition these accessing methods will apply. Besides, this paper will devise several ways to provide Centrex services to enterprise customers and analysis how to share the common services which can be provided by both the PBX and IMS Centrex AS.