Research And Implement Of SIP Based Mobile Network

Next generation network (NGN) is service-driven network, which can provide many applications such as voice, data and video SoftSwitch is the core technology which stands for the separation between transmission and access as well as services and control. Now there are two kind of application-layer control protocol BICC(Bear independence Call control) and SIP (session initiation protocol).SIP is an application-layer control protocol defined by IETF that can establish, modify, and terminate multimedia sessions (conferences) such as Internet telephony calls. The SIP has a good prospect for it's simple and preferable expansibilities.IMS(IP Multimedia Subsystem )is proposed in 3GPP release5. IMS main goal can provide common control and management functions of multimedia service in the future based on the all IP 3G network.PoC(Push to Talk Over Cellular) service is one kind of VoIP services in the motion network application, permit user through the specific pressed key establishment the half-duplex communication service which can corresponds immediately with each other or the many users.Through the reading massive literature material, refers to the OMA standard and the 3GPP standard analysis the third generation wireless increment service PoC primary service characteristic based on the SIP agreement.Reference OMA standard analysis design and realize PoC service...