Asterisk based VOIP in Light Fidelity

Abstract

VoIP is a term refers to Voice over Internet Protocol enables to communicate voice over the existing TCP/IP. As this overcomes the challenges and drawbacks of the PSTN traditional circuit based communication system. These reviewed papers used experimental quantitative methodology approach. By conducting simulation both on hardware and software. The software is Asterisk based IP PBX. Asterisk is a Digium sponsored open source communication platform product written in C programming language put on OS that turns ordinary PC to a telephone and it runs on Linux OS.it uses different types of communication protocols such as SIP, SCCP,H.323, MGCP. And the audio CODECS are also provides compression capability to save network bandwidth. The most popular are G.711, G.722, G.723, G729 etc. This asterisk handles call routing requested from both hard phone and softphones clients. The softphones can be installed and worked on both types of OS as well as in android Smart Phones & devices. These different solutions are proposed to overcome different types of problem. In general this open source VoIP is saves different types of costs of enterprises and an organizations such as call fee costs, installation cost, human power cost and investment cost and it adds both flexibility, scalability, reliability, &manageability. Beyond this some problems are also solved by proposing Asterisk based VoIP using Wi-Fi communication in order to have movable communication rather than communication only in an office desk, call on pocket maximizes productivity of the organizations or enterprises. The last concern issues is VoIP security problems as this protocol is a new and works over the IP it inherits all the strength and weaknesses of the IP and this leads to VoIP attack by un authorized personnel. In order to overcome this types of problems VoIP using Open VPN is proposed to interconnect different branches from different sites of the organizations. To some extent this helps to have secure VOIP Communications between the branches over the secure tunnel. But there are other still unseen gaps. These are cable, wireless costs, installation costs and maintenance costs. The second one is as the number of participants of both the LAN and WAN are increasing from time to time it results communication bottle neck. Due to this reason we will be faced to law voice communication and interruption. The last one is due to the Wi-Fi radio frequency interference with some equipment’s such as airlines, hospital and nuclear and chemical plantations we will not have VoIP communications as this interferences leads to some damage and risks. Even though these gaps are observed and identified all the great works and contributions of the scholars are appreciated.