The evolution of the information technology yields to a converged data and voice network based on IP technology.Tempted by the benefits of lower phone bills, centralized management and rapid deployment, the critical areas of VoIP security and network integrity are often neglected. The existing security solutions fail somewhere to protect VoIP infrastructure. The need arises to protect VoIP services from different attacks that target network bandwidth, server capacity or server architectural constrains. Here, we have discussed various challenges for VoIP network and, propose a security architecture, to monitor, detect, analyze and counter attacks relevant for a SIP-based VoIP infrastructure.
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