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.