No abstract

Voice over Internet Protocol, commonly known as VoIP, is the routing of voice conversations over the Internet Protocol (IP)-based network. As the technology is in need to extend the IP telephony deployments, securing the VoIP infrastructure will become increasingly important. This thesis outlines the VOIP technology, the current VoIP security threats and a brief look is taken at present methods of how to secure the emerging technology where Voice over the Internet Protocol is vulnerable to a number of attacks.Security is an essential consideration for VoIP providers since each component in the VoIP infrastructure can be used as a target, and VoIP has specific security challenges as well.Firstly this thesis discusses the VOIP as the new promising technology over the old deployed PSTN. Secondly, addresses the security issues and concerns of this new technology. Finally, will discuss my proposal of securing the voice over IP using the blowfish encryption technique at a layer between the SAPI. "Speech application programming interface" and the TAPI. "Telephony application programming interface"on the hardware level compared to other VOIP security proposals.