Web applications are generally less interactive than desktop applications. Due to the simple request-response model between web browsers and web servers, users usually experience frequent waiting during a session whenever the web applications need to get data from the server. After a browser sends out a request and await the response to return from the server, no further requests can be taken during this waiting time. In this paper we propose integrating the Ajax approach to the design of a web-base analyzer for Session Initiation Protocol (SIP), which is a popular protocol in IP telephony industry. By getting data asynchronously from the server, this web-base analyzer can monitor the SIP messages on the server in real-time without reloading.