I have a medical group that has six sites. They want to install point to point t-1's at each site. Can I use 2 cisco 2620 routers for this or will I need to use a cisco 3640. This will be set up in a star config. So at the main hub there will be 5 point to point t-1's terminating. They have frame now, but it is cheaper to put in t-1's than to bump up the speed on the frame.