GGSN/PGW to LNS recommendations

Hi ! I'm looking for a GGSN/PGW implementation that would act as a LAC, to re-encapsulate PPP sessions into L2TP tunnels to some LNS already deployed for traditional IP-ADSL collects. I found that feature available in Cisco ASR5000 but couldn't yet find any other. Would you have any pointer or references ? Thanks ! -- Jérôme Nicolle +33 6 19 31 27 14