Voip on IP PBX System Using Secure VPN Communication and Delay Analysis (original) (raw)

Secure and Optimize VoIP Communication Using QoS Technologies and VPN

Zenodo (CERN European Organization for Nuclear Research), 2022

The use of Voice over IP (VoIP), which enables two users connected to Internet to have a voice conversation, plays a vital role on the performance of an enterprise companies. In this research we have focused in the Virtual Private Network (VPN) environment and how to run voice application over it. The Voice Over Internet Protocol (VOIP) is as a combination of IP networks, voice applications and voice calls which being replaced by the old service conversation and created their evolution at the technical and conceptual framework of phone. This technology is an innovative form of phone that can dramatically increase performance and capacities of telephone service for businesses and individuals around the world. But voice qualities, security, Jitters, Echo, Data loss are the pertaining problems associated with VoIP. To overcome this limitation in this research, we used Simulation method in Cisco packet tracer to secure this technology using VPN. This is because VPN establishes a secure, encrypted connection between a computer and the internet, providing a private tunnel for ones data and communications while he/she uses public networks. Thus, provide users with a secure communication platform and at the same time optimized the technology using QoS technologies so as maintained and assure service's performance and to avoid degradation of speech quality.

Secure VoIP Transmission through VPN Utilization

2016

—Voice over IP (VoIP) is one of the rapidly growing communication technologies. However, the widely used VoIP protocol suite, H.323 is unable to maintain its performance when it is concerned with scalability. To overcome these limitations and to manage and establish multimedia sessions Session Initiation Protocol (SIP), a lightweight application layer protocol was designed. But being a text-based protocol it has high vulnerability to security attacks. Thus to provide users with a secure communication platform methods are required to pursue protection for SIP VoIP system. At the same time QoS is also to be maintained to assure service’s performance and to avoid degradation of speech quality. Thus, the proposed approach is based on virtual private network (VPN) tunneling utilization for securing communication on VoIP network while maintaining the quality. Index Terms—Voice over IP (VoIP), H.323, Session Initiation Protocol (SIP), Virtual Private Network (VPN). I.

VPN Analysis and New Perspective for Securing Voice over VPN Networks

Fourth International Conference on Networking and Services (icns 2008), 2008

Security and privacy become mandatory requirements for VoIP communications that needs security services such as confidentiality, integrity, authentication, non-replay and nonrepudiation. The available solutions are generic and do not respect voice specificities and constraints. Thus, QoS of the voice is affected by delay, jitter, and packet loss. New security solutions must take into account the real-time constraint of voice service and their mechanisms should address possible attacks and overhead associated with it. Nowadays, VPNs (Virtual Private Networks) is considered the strongest security solutions for communications over IP networks. Most VPN solutions are implemented to tunnel data traffic while the trend toward a converged data and voice network, however, places new demands on VPNs to support real time traffic. In this paper we compare the VPN security protocols presenting their advantage and drawbacks. Then we present our new solution to secure voice over IPSec VPNs while guaranteeing the performance and quality of services, without reducing the effective bandwidth. We use the AVISPA model to analyze the security vulnerabilities of exchange messages to initiate session and establish VPN.

Performance Analysis of Virtual Private Network for Securing Voice and Video Traffic

International Journal of Computer Applications, 2012

Security and privacy become mandatory requirements for voice and video communications that needs security services such as confidentiality, integrity, authentication, non-replay and non repudiation. Stringent quality of service (QOS) maintenance for voice & video communication is a major challenge. New security solutions must take into account the real-time constraint of voice & video and their mechanisms should address possible attacks and overhead associated with it. Nowadays, Virtual Private Networks (VPNs) is considered the strongest security solutions for multimedia communications over IP networks. In this paper, analysis and experimental results for an evaluation of the QOS of voice and video traffic are presented. A comprehensive set of measurements like packet delay variation, Mean Opinion Score (MOS), packet end to end delay, traffic received, traffic sent are obtained. These results are further analysed to study the effect of VPN on these parameters. Experimental results confirm that, depending on the type of the traffic, the overall security of the networks is improved, with a reasonable decrease in term of performance.

Effect of some Security Mechanisms on the Qos VoIP Application using OPNET

Voice over Internet Protocol (VoIP) is an application from the internet services that allows us to communicate with each other. VoIP requires Quality of Service (QoS) because it is very sensitive to loss and delay of the information. Therefore, QoS of VoIP is needed to ensure that voice packets are not delayed or lost during the transmission over the network. The objective of this research is to study the effect some of the Security Mechanisms on the VoIP Qos. In this work, simulation tool OPNET Modeler version 14.0 is used to implement the proposed network (VoIP Network). The proposed network is a private network for a company with two locations located at different countries around the world in order to simulate the communications within the same location locally and the communications between two locations as a long distance and analyze VoIP QoS based on measuring the major factors that influence the QoS for VoIP according to international telecommunication union (ITU) standards including: delay, jitter and packet loss. In this research, a comparison was executed between some security mechanisms like Packet Filter Firewall and Virtual Private Network (VPN) and it was found that VPN gives the better QoS from the traditional firewall for VoIP networks.

Performance Analysis for VoIP NAT Traversal in a Secured SIP System

International Conference on Aerospace Sciences and Aviation Technology, 2011

Voice over IP technology has rapid growth on network convergence in deployment of converged networks within enterprises. Most enterprises today sit behind Firewalls and also use private IP addressing behind NATs (Network Address Translators). These NATs cause significant problems for multimedia over IP to work and function properly. The de-facto Internet standard Internet Protocol (IP) is not secure. All types of business conducted through Internet, raised the requirement for a secure protocol. IP Security Working Group of IETF has been working on IPSec (IP Security) protocols to protect the IP traffic on the packet level. There are problems faced when an IPSec traffic is intended to pass through a NAT device. NAT and IPSec is very hard to use together without a standard way which would provide simple management and interoperability between vendors. Nowadays there are many techniques and solutions are used to allow popular applications to work through NATs. In this paper we present the details of the problem and issues associated with NATs and then survey some ways to solve this problem in SIP which aspire to become the dominant protocol on the internet for establishing calls. As a case study, we simulate a VoIP network and study the behavior and quality of VoIP under this model. We study all the potential parameters that can deteriorate the quality of VoIP such as jitter, End-To-End delay, packet delay variation, and the effect of adding security to VoIP networks that has been measured using OPNET (Network Simulation Tool).

Performance Analysis of VoIP over BGP/MPLS VPN Technology

cms.livjm.ac.uk

This paper investigates the performance of VoIP over a BGP/MPLS VPN network from two different aspects. The first aspect investigates the impact on VoIP performance of the VPN tunneling process. This is based on a comparison of VoIP performance over a BGP/MPLS VPN network with its performance over an MPLS network, with particular regard to different QoS parameters, principally delay, jitter and throughput. The second aspect is a study of the most common VoIP codecs, namely, G.711, G.723.1 and G.729A over the BGP/MPLS VPN network. This is based on investigating different implementations of such codecs with respect to the packetization interval time in order to identify the optimal codec that efficiently balances between acceptable end-to-end delay and high bandwidth efficiency.The OPNET Modeler was used to create a VoIP-BGP/MPLS VPN simulation model for carrying out different scenarios. The results show that the BGP/MPLS VPN network has a positive impact on VoIP performance in comparison with its performance over an MPLS network. It also concludes that, following different implementations of the VoIP codecs, G.729A is the best codec for the VoIP-BGP/MPLS VPN network as it efficiently balances between bandwidth efficiencyand low end-to-end delay.

Eavesdropping Attack and using Virtual Private Network (VPN) to secure VoIP infrastructure

The world is changing rapidly, many new technologies have been invented. The higher the convenience and modernity increase, the greater the risks humans face. The risk that can be mentioned here is the insecurity of the network. Nowadays, there are a lot of cyber-attacks that are dangerous for the privacy of the governments, military, corporations, and each individual. One of the most common and quite dangerous cyber attacks recently is eavesdropping attacks. Eavesdropping attack is becoming a more and more popular problem and not easy to avoid. Therefore, this literature will demonstrate the importance of preventing eavesdropping attacks, basically dive into eavesdropping in a general view, why it becomes a matter of concern, and the way it operates throughout the network. Moreover, this paper will propose some of the solutions to circumvent eavesdropping attacks to a certain extent with their strengths and weaknesses. In this paper, because Voice over Internet Protocol (VoIP) is one of the technologies that could be easily intruded by an eavesdropper, I will choose a method using Virtual Private Network (VPN) with Secure Socket Layer (SSL) to prevent VoIP infrastructure from being eavesdropped. After being dissected in detail, this paper points out the strengths and limitations of SSL VPN, therefore, we will know should we use SSL VPN for VoIP infrastructure or not?