I'm currently in the process of upgrading a T1 frame relay circuit to AT&T Metro-E circuit, but I am not sure what WIC to use on my Cisco 2821XM router. I have already googled this but was unable to find any valid info. Has any one already performed this upgrade, and if so, what module was needed and what changes in config were needed that differ from a frame T1. Any help or direction will be greatly appreciated. Thanks