Install Openconnect, a client for Cisco's [AnyConnect SSL VPN](http://www.cisco.com/en/US/netsol/ns1049/index.html), which is supported by the ASA5500 Series, by IOS 12.4(9)T or later on Cisco SR500, 870, 880, 1800, 2800, 3800, 7200 Series and Cisco 7301 Routers, and probably others.