You may have to explain in more detail what you are trying to accomplish. The B-channels are "bundled" (multiplexed) together in a BRI and PRI configuration. There are installations where the S-bus (essentially the ISDN BRI) is shared, such that multiple boxes can "share" B-channels. However, many cisco devices do NOT support such a configuration (Hardware limitations); the MBRI on the 7200, 4xxx, 3600, 2600 does not support sharing the S-bus; the 100x, 1600, 2500, 7xx can. This type of config would also need to be coordinated with your carrier.
