pix 6.3 pptp and L2TP

I have pptp configured on a pix,

vpdn group kt accept dialin pptp vpdn group kt ppp authentication chap vpdn group kt ppp authentication mschap vpdn group kt ppp encryption mppe 40 vpdn group kt client configuration address local ktvpdn vpdn group kt client configuration dns 1.2.3.4 vpdn group kt pptp echo 60 vpdn group kt client authentication local vpdn username abc password xxx vpdn username abc password xxx vpdn enable outside

now I need to add l2tp access for a customer,

possible?

thanks,