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Voice has always been the poor cousin of data security. In VoIP networks, most of the packets are transmitted without Encryption. Any unauthorized person can capture the packets with the use of packet sniffer and can obtain user information like user identity, SIP phone numbers and PINs required for identity theft. This report introduces an Android Based Application, which will enable the two parties to communicate securely but with an altogether different technology for call flow. Here, the authors digitize the voice (VoIP) and then transmit it using the GPRS data channel. The digitization process includes the encryption phase using ZRTP technique in order to generate unique keys every time a call handshake is done.
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