Abstract
The internet has been undergoing rapid and continuous growth over the past few years. The most significant development the telecommunication industry has witnessed is the evolution of Voice over IP technology. This technology uses the internet as a medium for transmitting voice during a telephone conversation between two or more parties. VoIP technology comes with numerous benefits like reduced call cost and wide variety of add-ons to both the service providers and the end users. Despite all these, the technology is subjected to security risk because of the open nature of the internet. Much emphasis has been placed on the quality of service of VoIP over the years and dark eyes have been turned on its security. This study therefore aims to identify the security threats and attack VoIP can be exposed to during transmission, produce a VoIP system using the open source Asterisks before securing the network using IPSec VPN
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