The good news is that it can be integrated seamlessly into the same infrastructure that is currently used for quality computer and telephone data.The digital far above current cellular technologies. This book will be the first to discuss Session Initiation Protocol (SIP), Quality of Service (QoS), and interoperability in connection with Wi-Fi phone. * Using current telephone and computer infrastructure this technology can be implemented at low cost * The Importance of Quality of Service (QoS) and Wi-Fi phone security considered * Increase clarity of mobile phone calls beyond the basic use of digital data transfer