Paper Title
Matlab Based Echo Cancellation System

Because of call setup information and actual "voice data" is transported on an open network like Internet, there are some main challenges with VoIP security today. This section will give a brief introduction to the technology in use and it also introduces short description of security risk. Voice over Internet Protocol (VoIP) is a technology that enables one to make and receive phone calls through the Internet instead of using the traditional analogy PSTN (Public Switched Telephone Network) lines. it is packetisation and transport of classic public switched telephone system audio over an IP network. It allows 2-way voice transmission over broadband connection. It is also called IP telephony, internet telephony, and voice over broadband, broadband telephony. Keywords - Voice over Internet Protocol (VoIP), Inverse filtering