In this paper, we describe the design and implementation of an audio wiki application accessible via the Public Switched Telephone Network (PSTN) and the Internet for educational purposes. The application exploits mature World Wide Web Consortium standards such as VoiceXML, Speech Synthesis Markup Language (SSML) and Speech Recognition Grammar Specification (SRGS). The purpose of such an application is to assist visually impaired, technologically uneducated, and underprivileged people in accessing information originally intended to be accessed visually via a Personal Computer. Users may access wiki content via wired or mobile phones, or via a Personal Computer using a Web Browser or a Voice over IP service. This feature promotes pervasiveness to educational material to an extremely large population, i.e. those who simply own a telephone line.