The Astium¨ VoIP PBX is one of the most advanced and feature rich telephone system nowadays available. It integrates phone calls over ISDN, VoIP, GSM, WiFi and DECT into a very flexible system. Astium¨ is based on the popular open source PBX named Asterisk¨. This manual describes the installation of Astium¨. Please visit our website at www.astium.nl for more information about Astium.