Future Works

Based on the research results in this dissertation, the following design issues on the IP multimedia services network can be investigated further.

Interworking with P2P VoIP clients: Recently, some successful cases of P2P VoIP communications such as Skype have become very popular. The interworking function for a P2P VoIP system and a client-server one (such as SIP) is an important issue that needs to be investigated. Furthermore, many instant message applications such as Yahoo! Messenger, MSN Messenger and GTalk from Google have provided Internet voice and video services. The routing, naming and interworking issues in a converged network which integrates the above applications can be further discussed.

Integrated WiFi and application level authentication: While WiFi was employed as one of the access network of UMTS, the one-pass authentication may be integrated into the UMTS and WiFi interworking network. In addition, the IMS application service platform provides a flexible environment for the third party to run their own applications. Before the third party provides the services, the MS has been authenticated at the GPRS level, the IMS level, and maybe the application service platform. We can further discuss the integration of the authentication procedures in the GPRS, IMS, and application platform.

Call center emulator with prediction algorithm: In the call center, it is very useful to monitor the performance of the prediction algorithm. With the logs and statistics of the performance we could fine tune the prediction algorithm. The emulation of the call center could also provide useful information while managing the call center.

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