Design Implement and Deploy Security Mechanisms for Session Initiation Protocol

Abstract

Public Switched Telephone Networks (PSTN) is replaced by VoIP now a days and it is widespread in use. VoIP has converged the data and voice into one network. That is called converged network. There are several protocols that support the convergence and VoIP network. These protocols are H.323, Session Initiation Protocol (SIP) and IAX. SIP is a multimedia signaling protocol. It is used to create, modify or terminate sessions with one or more participants involved. Due to convergence of various networks, it has given rise to various security threats and risks. In this thesis, VoIP network for SIP protocol is deployed in open source software AsteriskNOW. Further thesis discusses the various security issues in SIP and implements various mechanisms to defend against different types of attacks.