The process of downloading the Cisco 3911 SIP Phone Firmware 8.1.4a driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Cisco 3911 SIP Phone Firmware 8.1.4a driver from the primary server - this is the manufacturer’s Cisco 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 Cisco 3911 SIP Phone Firmware 8.1.4a diver.