Abstract
Online Virtual Classroom using SIP is another alternative for the users who have the network constrain. The system composes of two user agents, which are the teacher’s user agent, and the student’s user agents. Both user agents contain three main functions: slides control, live text chat, and 2-ways real-time voice communication. The user agents are compatible with an Open source SIP server called “Asterisk”. No modification is required on the SIP server. The purposed system allows the teacher, and the student to communicate via text chat and real-time voice with a low bandwidth connection. PowerPoint files would be loaded into the students’ computers before the class start. The slide control module will synchronize the slides between the teacher and all students. The system also supports voice communication using SIP and RTP. The network efficiency analysis is done to evaluate the performance of the purposed system compare to a commercial web conference system.
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