Previous support existed for Nokia MetroSite, UltraSite and InSite models, resulting in BTS model name "nokia_site". However, there exist newer Nokia BTS models that also support E1 Abis and can be supported by OsmoBSC with relatively small changes: Flexi EDGE, Flexi Multiradio and Flexi Multiradio 10. Out of these newer models, American 2G Cooperative (the present patch author's current organization) has only Flexi MR at the present time - hence this model shall be the first "new" Nokia BTS to be supported.
The first change required in order to support Flexi MR is ability to receive long OML messages that have been segmented by the BTS: the new BTS sends a much longer BTS_CONF_REQ message, and we have to handle it correctly.
