vpdn enable on 3640 ?

[Gabriel Nickel]

Hi folks, we got a problem here with a 3640. any attempts to start a "vpdn enable" command are answered with an "unrecognized command" (or something like that) message. does this mean that we have to load a certain feature pack on the 3640? we checked the cisco site but couldnt find any l2tp&vpdn (we need both running on this machine) feature for this platform.   TIA, Gabriel Nickel