The African Journal of Information and Communication (AJIC)

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https://wiredspace.wits.ac.za/handle/10539/19251

The African Journal of Information and Communication (AJIC) is an academic journal published by the LINK Centre, School of Literature, Language and Media (SLLM), Faculty of Humanities, University of the Witwatersrand, Johannesburg. Accredited by the South African Department of Higher Education and Training (DHET), AJIC is an interdisciplinary, open access journal concerned with Africa’s participation in the information society and digital network economy. The journal does not impose author processing charges. AJIC's predecessor, The Southern African Journal of Information and Communication (SAJIC), was published from 2000 to 2008, before becoming AJIC in 2010.

Corresponding Editor: Lucienne Abrahams. AJIC Submissions

ISSN: 2077-7213 (online version)

ISSN: 2077-7205 (print version)

DOI: https://doi.org/10.23962/10539/19251

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Browsing The African Journal of Information and Communication (AJIC) by Author "Agutu, Gordon"

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    Context-Aware VoIP Congestion Control Service
    (LINK Centre, University of the Witwatersrand (Wits), Johannesburg, 2011-02-15) Agutu, Gordon; Djouani, Karim; Biermann, Elmarie; Noel, Guillaume
    IP networks can have difficulty coping with delay-sensitive VoIP traffics during emergency situations caused by fires and related disasters. During emergencies there is a huge increase in voice and video traffic, causing a huge strain on the network. The strain on the network is as a result of both essential and non-essential traffic. In such crisis situations, calls originating from or destined for rescue personnel, such as doctors and police, are considered essential. Any other calls from eyewitnesses and the public are considered non-essential, since they degrade the quality of service for the emergency response teams by consuming the scarce network resources. Providing the rescue team with the quality of service that they require necessitates network access restriction for non-essential traffic. In this paper, the authors present a voice and video service that uses Context-Awareness and Semantic Web technologies to restrict network access to privileged users during crisis situations. The service monitors the network for crisis conditions, enables the network to respond appropriately when a crisis occurs, detects the end of the crisis and reverts to its default state.