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Exploiting Voip Telephony in IP-Pbx Solution

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Exploiting Voip Telephony in IP-Pbx Solution Exploiting VoIP Telephony in IP-Pbx Solution. A.A.A. Ajasa and O. Shoewu* Department of Electronics and Computer Engineering, Lagos State University, Epe Campus, Lagos State, Nigeria. E-mail: [email protected]* ABSTRACT INTRODUCTION This study entails the simulation and The structure of the wire line telephone network implementation of a VoIP telephony system using has not fundamentally changed since Alexander an IP PBX solution. A new technology called Graham Bell invented the telephone 130 years Voice over Internet Protocol (VoIP), or Internet ago. Calls travel along dedicated phone lines and telephony means that your voice is carried over are switched in various places to maintain an the IP network, otherwise known as the Internet. electronic circuit leading from the phone where Voice, which is an analogue signal, is converted the call is made to the phone with the number to digital data, which is then disassembled and being called—hence the phrase “circuit-switched transmitted through the Internet only to be re- network” [1]. converted back to an analogue signal on the other end using an IP-PBX solution which is a While digital technologies have increased the Linux base server that supports a GUI web functionality of the phone system, any intelligence interface. This service can be properly managed in the system is largely engineered into the circuit and deployed over a network with less stress and switches of the telephone company’s central expenses. The IP PBX main server also has office. Contrast to that the broadband Internet integrated in it other communication services world. Consumers use a computer to type an such as instant messaging using an Openfire email that is then separated into digital packets server, electronic mail using a postfix server and (groups of ones and zeros) that are transported FTP service all embedded in the IP PBX via a broadband “pipe” onto high-speed backbone SYSTEM networks. The packets are then reassembled at the destination account, which can be configured This technology promises an evolutionary leap for access from any Internet connected computer beyond the standard telephone service we have anywhere in the world [2]. been accustomed to, as well as a host of benefits for individuals. The new technology transmits Many years ago it was discovered that sending a voice signals the same way email is sent, using signal to a remote destination could have be done the Internet’s data-transfer protocols to break also in a digital fashion: before sending it we have conversations into digital packets that can be sent to digitalize it with an ADC (analog to digital on lower-cost, more efficient “packet-switched” converter), transmit it, and at the end transform it networks. That innovation makes many other again in analog format with DAC (digital to analog innovations possible, from eliminating the converter) to use it. “VOIP works like that, distinction between local and long distance calls, digitalizing voice in data packets, sending them to easily maintaining several telephone numbers and reconverting them in voice at destination”. in a single account, to sorting and storing voice Digital format can be better controlled: we can messages on your computer, FTP between users compress it, route it, convert it to a new better and instant messaging. This project was able to format, and so on; also we saw that digital signal address the persistent communication problem is more noise tolerant than the analog one (GSM which existed in the department by allowing users vs. TACS) [3]. TCP/IP networks are made of IP to communicate with the services the solution packets containing a header (to control provided with less stress and comfort. communication) and a payload to transport data: VOIP uses it to go across the network and come (Keywords: voice over internet protocol, telephony) to destination. The Pacific Journal of Science and Technology –212– http://www.akamaiuniversity.us/PJST.htm Volume 13. Number 2. November 2012 (Fall) In telecommunications (beyond the level of two users on local lines while allowing all users to cans and a piece of string) there are 2 bi- share a certain number of external phone lines. directional streams (possibly over the same The typical IP PBX can also switch calls between channel. In fact, it was common for a number of a VOIP user and a traditional telephone user, or years to have the control stream riding on the between two traditional telephone users in the same medium as the voice stream. This is known same way that a conventional PBX does [4]. The as "in-band" control or signaling. abbreviation may appear in various texts as IP- PBX, IP/PBX, or IPPBX. A new technology called Voice over Internet Protocol (VOIP), or Internet telephony, promises With a conventional PBX, separate networks are an evolutionary leap beyond the standard necessary for voice and data communications. telephone service we have been accustomed to, One of the main advantages of an IP PBX is the as well as a host of benefits for consumers. The fact that it employs converged data and voice new technology transmits voice signals the same networks. This means that Internet access, as way email is sent, using the Internet’s data- well as VOIP communications and traditional transfer protocols to break conversations into telephone communications, are all possible using digital packets that can be sent on lower-cost, a single line to each user. This provides flexibility more efficient “packet-switched” networks. That as an enterprise grows, and can also reduce innovation makes many other innovations long-term operation and maintenance costs. Like possible, from eliminating the distinction between a traditional PBX, an IP PBX is owned by the local and long distance calls, to easily maintaining enterprise. several telephone numbers in a single account, to sorting and storing voice messages on your computer. LITERATURE REVIEW However with the advent of digital transport Voice over Internet Protocol, VOIP, also known systems, most in-band signaling has been as Broadband phone or IP telephony service, is replaced by a separate control channel which is changing the telephony world. Traditional phone known, appropriately enough, as "out-of-band" lines are slowly being phased out as businesses signaling), a "voice" stream (which includes voice, and households around the world embrace the music, fax squeals, modem shrieks, etc.) and a benefits and features that VOIP technology has to control stream. VOIP refers to the transport of a offer. As this evolution accelerates, it is telecommunications voice stream over a data worthwhile to stop and take a look at the history network using the data transport mechanisms of VOIP. One will find that as interesting as the associated with the Internet, called the history of VOIP may be, the future of VOIP is Transmission Control Protocol/Internet Protocol even more intriguing and exciting. (TCP/IP) suite. The history of VOIP shows that this technology A vendor presents the following ingenious and started as far back as 1995, when a small useful application as part of their VOIP strategy. It company called Vocaltec released the first is a solution primarily for remote workers. The internet phone software. This software was worker needs an IP connected computer and a designed to run on a home PC and much like the Plain Old Telephone System (POTS) line. The PC phones used today, it utilized sound cards, worker uses a browser to connect to a web-site microphones and speakers. The software was which, in turn, communicates with the IP PBX. called "Internet Phone" and used the H.323 The user then identifies and authenticates, giving protocol instead of the SIP protocol that is more the phone number of the POTS phone. The PBX prevalent today. Vocaltec had initial success with connects to the telephone, and provides all the Internet Phone, and had a successful IPO in sophisticated features of the PBX like hold, 1996. It was the Skype of the mid 90s [3]. conference calling, etc. by means of the phone line plus feature access through the computer By 1998, VOIP traffic had grown to represent interface) [4]. approximately 1% of all voice traffic in the United States. Entrepreneurs were jumping on the A private branch exchange (telephone switching bandwagon and were creating devices which system within an enterprise) that switches calls enabled PC-to-phone and phone-to-phone between VOIP (voice over Internet Protocol or IP) communication. Networking manufacturers such The Pacific Journal of Science and Technology –213– http://www.akamaiuniversity.us/PJST.htm Volume 13. Number 2. November 2012 (Fall) as Cisco and Lucent introduced equipment that Where is it going to be implemented and could route and switch the VOIP traffic and as a assembling of hardware devices needed for result by the year 2000, VOIP traffic accounted the IP PBX VOIP system? for more than 3% of all voice traffic. What type of network infrastructure is made available? Most organizations, companies, and institutions What call solution is needed? are switching to IP PBX compared to the Installation of the software components and conventional PBX. An IP PBX handles both voice configuration of the required servers. and data, it is cheaper since it requires only one Writing and modification of scripts needed for network to install and maintain instead of two, It the GUI interface. reduces equipment costs (only IP based What kinds of equipment are going to be products; no voice products needed), reduces used to achieve this solution? long distance charges for inter-branch office calls What extra feature the customer/user might (by using the data network), is easier to provision want to use this solution for? (just plug in from wherever), supports services such as unified messaging, is more flexible, is more scalable, makes it easier to provide new Circuit- Switched Telephony services, such as data and video collaboration, allows remote configuration (over the Web), and Before digital networking took off, everyone had supports modular software upgrades, new to use the one and only Plain Old Telephone technologies (new CPUs, etc.) are easy to Services (POTS).
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