I have a situation where links are not big enough and we have to build arround 800 laptops + desktops. doing so is causing a chaos at the time when all the build traffic goes to notes server. temporary solution, i have two isdn circuits available on both sites. I configured two 2600 routers. when I connect to isdn circuits L1 and L2 are fine but L3 doesn't work. I checked isdn stat for the above. when i checked controllers e1 found out that one is balanced and the other is unbalanced. can this cause problem? I'm not sure because this is my first experience with isdn. I would really appreciate any help possible. any sample config if any one has please. many thanks in advance.