Hi Borjan,
you seem to be confusing different technologies. A BTS is a 2G devices, which is specified to implement Abis (RSL + OML) to a BSC. Abis, including some vendor-specific dialects are implemented in OsmoNITB (deprecated) and OsmoBSC.
Your subject line indicates "IuB". This is the protocol of a 3G NodeB to a RNC, and has nothing to do with Abis. We don't implement it.
Please clarify which exact equipment you would want to use, as well as as much information about the protocol as you have.