Hello Again, So as my previous post mentioned, I recently acquired an Ericsson RBS 2401. In looking through the configuration, it only allows for a T1 connection, not an E1. The first issue I see with this is I haven't been able to find a mISDN supported T1 card. I assume all of the BS-11 are E1, so I suppose T1 support has never come up. Not a coder myself, I'm not going to be a lot of help in that department. But I can get a T1 card and hook this RBS up to a Linux box and do any debugging that might help move things along. I'm open to any suggestions. I know Harald was looking into getting traces for Ericsson BSC <-> BTS traffic, so hopefully that will help as well. Thanks again, Caleb