[Freeswitch-users] sip-force-contact: which to choose?

Hi all, i read in latest source code of FS (of yesterday) that for the handling of sip-force-contact now there is a new option: NDLB-connectile-dysfunction-2.0 Which are the improvement of NDLB-connectile-dysfunction-2.0 respect to NDLB-connectile-dysfunction? I read that the 2.0 also make the users registered with "AUTO-NAT 2.0". Fabio