Just the IP/ADSL feature set, the latest you can download is 12.3(1a) which is a Limited Deployment release. If you want an Early Deployment series in the T train, the latest you can get is 12.3.2 T. For this IOS, min 48 MB ram, 16 MB flash. This IOS was just released on july 28th.
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus
