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VoIP technology in general refers to the set of software, hardware and industry standards that enable “voice” to be transported using the Internet Protocol (IP). The technology is compelling to a wide audience for several reasons: • VoIP phone bills are typically cheaper than traditional phone bills to the consumer. • VoIP networks offers providers easier IT management and reduction in operating cost for a combined network for voice and data. • VoIP technology is feature rich to support next generation multimedia applications With private phone conversations being conducted on insecure public networks, security of VoIP communications is increasingly important. VoIP has a very different architecture than traditional circuit based telephony, and these differences result in significant security issues. Encryption is one of the essential security technologies for computer data, and it will go a long way toward securing VOIP[1,2,3]. In our discussion we proposed a Biometric-Crypto system which generates a cryptographic key from the fingerprints for Encrypting and Decrypting the voice data packets for VoIP Security. if your VoIP packets traverse the Internet to reach a destination, a number of attackers have a shot at your voice data. The calls are also vulnerable to hijacking or a man in the middle attack . In such a scenario, an attacker would intercept a connection and modify call parameters. This is an especially scary attack, since the participants likely wouldn't notice a change. The ramifications include spoofing or identity theft and call redirection, making data integrity a major risk. One way to help protect your privacy is to encrypt these conversations so that they aren't simply floating around out there for potential hackers to latch onto. In our approach we have proposed a system which will encrypt the VoIP data packets using Advanced Encryption Standard (AES)[7] with the novel method of Biometrics based Key Generation technique.