A high-quality 4-port wired broadband router that allows you to share your Internet connection and incorporates a business-class firewall. In addition the 2 x FXS port and 1 x FXO port (PSTN lifeline) allow you to make telephone calls over the Internet using your standard telephone handset with Billion’s renowned built-in Quality of Service (QoS) offering superior call quality and PSTN lifeline giving direct access to emergency services numbers in case of Internet outage