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CSCN means "Circuit Switched Core Network" (-in-the-box) and will become a NITB-without-BSC, so that it talks Iu-cs to the HNBGW and talks 'A' to an external BSC. Copying NITB is debatable: on the one hand, we've agreed on the name Osmo-CSCN for the end result (without internal BSC). On the other hand, I will probably add Iu-cs into the NITB code incrementally, in such a way that theoretically, both Iu-cs and the internal BSC functionality could be used at the same time. So Osmo-CSCN will be a NITB plus Iu-cs for a while. Instead of adding to NITB, I prefer to work on a copy, so that the original NITB remains more or less unchanged. Only a later step will clearly distinguish CSCN from NITB: when the BSC part is split off for the benefit of a proper A-interface, and CSCN talks to an external BSC.