A system for multimedia communications implemented with reconfigurable technology is disclosed. The system includes: a SIP engine implemented in hardware that executes functions defined by Session Initiation Protocol (SIP); a XML engine implemented in hardware that executes functions defined by Extensible Markup Language (XML); and an interface that coordinates functions executed by the SIP engine and the XML engine. A standard set of features are provided for robust communications while permitting the addition of more features to enhance the multimedia communications experience. For example, audio and video communication, instant messaging and presence can be provided by the system while P2P and IP Multimedia Systems (IMS) can be provided through expansion. Reconfigurable technology allows the system to achieve optimal performance in performing various tasks.