Voice over IP using IAX on 802.11s and the OLPC XO laptop
Tilila El MoujahidOral Defence Date:
Monday, June 11, 2012 - 13:00Location:
Professors Barry Levine, Sameer Verma (ISYS), and Arno Puder
Access to telephony remains a luxury in a vast portion of the world especially the poorest areas. Governments usually lack infrastructure and funds, and very often postpone projects to equip these areas with adequate solutions to an uncertain future. This prevents inhabitants from accessing telephony facilities for emergencies or simple daily activities. Advances in wireless technologies and telecommunication are giving hopes for cost effective solutions and it is believed that Voice over Internet Protocol (VoIP) on wireless networks holds exploitable potential for providing telecommunication means to remote rural areas without requiring heavy and costly installations. The present study proposes a solution to the voice communication challenge using VoIP over wireless networks. Specifically, it investigates the use of a VoIP protocol called Inter-Asterisk eXchange (IAX) over a type of wireless network called mesh. The VoIP application is deployed on a mesh-enabled laptop specifically designed for rugged environments called XO, created by the One Laptop Per Child (OLPC) project. The main objective was to (1) determine the number of simultaneous calls that can be supported in such a setting and (2) assess the quality of the calls in comparison with accepted VoIP quality standards. In this study, the variables affecting call quality are determined and tests varying each of those variables are made, using a network of 10 XOs. It was found that 5 simultaneous calls can be supported with acceptable quality.