Could someone please advise on the specifications for a device that will allow 20 remote users to dial in to my network via a normal telephone line (modem) and get VPN features?

I'm new to Cisco and hoping to implement a large Cisco solution. Unfortunately we're not in the position to hire an expert so I'm seeking some much needed advice!The general plan for phase 1 would be:A router with 9 interface cards, that will have a ...