The Research and Design of S-CSCF in IMS;

IMS was defined by 3GPP in release 5.

Consisting of the basic protocol and the extended application protocol,Diameter protocol is used as an AAA protocol in IP Multimedia Subsystems(IMS).

The Study and Implementation of Home Subscriber Server in IP Multimedia Subsystem;

Moreover,an example of COSFoTS,used in the development of IMS(IP multimedia subsystem) CSCF(call session control function),is given to illustrate the application of COSFoTS.

The Voice Call Continuity (VCC)-based IP Multimedia Subsystem (IMS) solution can accomplish Circuit Switched (CS)-IMS handover and is a approach to Fixed-mobile Convergence (FMC).

This paper proposes an IP Multimedia Subsystem (IMS)-based Internet Protocol Television (IPTV) solution, in which the HTTP Call Session Control Function (H-CSCF) equipment enables the integration of an IPTV system into an IMS core via the Mw interface.

The evolution from fixed Softswitch to IP Multimedia Subsystem (IMS) requires reasonable methods, steps and strategies.

Started with the IP Multimedia Subsystem(IMS) security mechanism,the flow of register and authentication in IMS were introduced;then combined with the ordinary threat in SIP protocol,the possibility of attack using the leak of SIP in IMS was analyzed.

Considering the property of MRT service and the architecture of network of IP multimedia subsystem(IMS),this paper proposes a solution using multimedia ring tone services platform(MRTSP)to provide value-added MRT services,including the design of system and signal flow.

At present,the session setup time based on the Session Initial Protocol(SIP) in IP Multimedia Subsystem(IMS)is affected by the constrained bandwidth of the wireless link,Frame Error Rate(FER).