Use a normal BRI B2B cable. 4 Cables are used. Side A: 3456Side B: 5634Rest are answered here:https://supportforums.cisco.com/message/4003038#4003038

Using the WIC-1B-S/T-V3 Interface alone you wont be able to simulate the back to back.Reason: WIC-1B-S/T-V3 does not emulate as network.e.g. : isdn layer1-emulate network Command wont work.You will have to use an NT/TE Interface to simulate a ISP Sid...

thanks for coming back..Please mark the post as solved..

Try to deleted the back up device and readding it..