http://www.internetmonitor.lu/Internettelephonie-DE_r17.html 2004-11-17T00:00:00+00:00 http://www.internetmonitor.lu/Telephonie-sur-Internet-FR_r18.html 2007-03-25T15:12:00+00:00 http://www.internetmonitor.lu/VoIP-EN_r230.html 2006-04-19T15:35:00+00:00