Encrypted Voice Calls with IP Enabled Wireless Phones over GSM/ CDMA/ WiFi Networks

A research on the related technology and implementation of IP phone based on WiFi network is discussed in this paper; it includes the net structure of the technology used in designing the terminal of IP phone. This technology is a form of telecommunication that allows data and voice transmissions to be sent across a wide range of interconnected networks. A WiFi enabled IP phone is used which is preinstalled with the Symbian Operating System and a software application is developed using J2ME which allows free and secured communication between selected IP phones in the WiFi network. This communication is done with the use of routing tables organized in the WiFi routers. Using the free bandwidth of 2.4 GHz communication channels are established. The communication channel being a free bandwidth is vulnerable to external attacks and hacking. Thereby this challenge of creating a secure communication channel is addressed by using two different encryption mechanisms. The payload and header of the voice data packets are encrypted using two different algorithm techniques. Hence the communication system is made almost fully secure. Also the WiFi server can tunnel the calls to the GSM network using UNC. Moreover the creation of a vertical handoff protocol will provide seamless communication for users. This handoff is defined in the context of a diverse network environment. It is cost effective, it allows easier communication, is great for international usages, and it can be very useful for large corporations. In time this will become a cheap and secure way to communicate and will have a large effect on university, business and personal communication.