RAS solution please?!

I'm in need of knowing what product will alow me to do the following...

I have a full T1 from the telco and I have a need for about 20 remote dial in users. I need to know of a product that will alow all the channels of data to be slip off into analog so that we have one T1 comming in but we can have numerous users dialing into the network and comming in thru the digital line. I know that if you are dialing analog to analog you can only get 33.6 but we want to get better than that. I guess what I'm looking for is something simalar to how an ISP uses the lines. I know that they don't have one-to-one analog lines.

(Why I can't do VPN is beyond me!!! but I can't due to higher powers that prevail)

Any help would be appreciated.

JKS