"Servgate - PointForce"
This firewall product is highly recommended by Brightcity. It does the normal firewall tasks such as stealthing all the ports not used, NAT and DHCP. But it also has VPN technology. Also look at the Servgate SG100.
It allows a Microsoft Windows XP Professional PC to connect to it across the internet, broadband or dial up. From the moment of connecting, you are part of that network and can sychronise your emails and see the data files on the office computers.
It would suit a small company,giving you the same remote working capability as larger firms. This product is normally based at the company head office.
You also require a standard router, such as the Westell 2400, or you can use your existing BT router.