Abstract
VoIP applications are popular on desktop computers, users use these applications to save the cost of communication. For corporate or educational organizations, it is hard to manage and monitor account and payment effectively because these applications are lack of the provision of a cost management interface. Also users are required to create their own contact list but the list cannot be shared. So, it is time consuming for organizational members. In the thesis, we proposed a cloud base VoIP communication platform—Kits Web Call and the extension system Kits Conference Call which can perform multi-party call. Kits Web Call has management system with hierarchical user structure, which can effectively supervise accounts and communication cost. Kits Conference Call provides a convenient multi-party call system, and users can use landline extension phone or mobile phone to execute conference call. Both these systems provide common contact list which can be shared to every user in the group.