Voip on IP PBX System Using Secure VPN Communication and Delay Analysis

VoIP (Voice over Internet Protocol) is the next generation telecommunication whereas traditional telecommunication systems have disadvantages on IP networking, ATM, Voice and Data communication. Security breaches, maintaining large network, QoS are important issues associated with communication. These led us to research and introduce virtual private network (VPN) for voice and data communication on hybrid private branch exchange (PBX). It can be implemented over the skeleton of existing architectures that helps organizations connect the spread out sites and distributed workers through a secure VPN using the existing public or private network. Voice can be transferred on secure VPN backbone and delay analysis of the network is the main objectives and IP PBX or SIP server which is used for voice gateway. Network simulation helps to analyze the possible problems of the data and delay which make us more confident of this research.