This isn't my expertise, but I thought you just need a Dynamic IP address and a decent router supporting VPN; I run my home network on a Draytek router and it works for me... It also isn't router specific...
I assume it is a organisation/company? A product I have had installed was Microsoft IAG (Intelligent Application Gateway) £10k; very easy to install, 2 factor authentication via Swivel or RSA token, but the best part is it will support home working with sufficient security; just publish your applications to the Gateway appliance.