| dc.description.abstract | The benefits of implementing an open source VoIP system at General Sir John Kotelawala Defence University (KDU) where an analog system is still being used, and VoIP system provides not only voice communication but also voicemail, call conference, call waiting and Instant Messaging (IM). As KDU is one of the largest defence universities in the South Asian region, the security of the system should be very high. The proposed system offers the overall security as it required an authorized person or group of people to monitor all the conference and the data exchange through the system. The implemented system is a server-based software-design, “AsteriskNow” software PBX Version 6.12.6522. If KDU ever decided to go with commercial VoIP based servers such as CISCO, 3CX; then KDU also has to use proprietary equipment such as CISCO servers, CISCO switches, and IP phones. For that, KDU will have to spend extremely higher capital expenditure. The system provides a softphone to every user. When a person is not available on the analog line the call automatically transfers to his/her mobile softphone. A database is maintained to store all the contacts and those contacts can be checked through the softphone. The most important feature in the system design is that the system uses a public IP (Internet Protocol) address, which connects the system with the outside world, and also any registered person who is outside of the KDU can connect with the analog extensions of the KDU. VoIP is considered as real-time communication and time sensitive service. After implementing the system network performance and voice quality have been tested. Compared to the existing system, clarity of the voice is greatly increased and the number of calls that can be handled simultaneously by the exchange is increased. Post research questionnaires have proven that the system is very useful, reliable and cost effective method for KDU. | en_US |
