Multiple IPSec Tunnels to same end point

Does anyone know of a wireless router that supports multiple vpn (software client)connections to the same end point or vpn server. A lot of companys claim that they support multiple ipsec tunnels, but I havent found one that will allow multiple connections to the same end point. We are using cisco client and a pix515, we have no problems connecting 1 person, but as soon as the second individual tries to connect from behind the same router the first connection is terminated.