The process of downloading the Aastra 9133i SIP Phone Firmware 1.4.3.0809 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Aastra 9133i SIP Phone Firmware 1.4.3.0809 driver from the primary server - this is the manufacturer’s Aastra official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the Aastra 9133i SIP Phone Firmware 1.4.3.0809 diver.