osmo-bts 0.4.0-3 (arm64 binary) in ubuntu cosmic

 OsmoBTS is a software implementation of Layer2/3 of a BTS. It implements the
 following protocols/interfaces:
    LAPDm (GSM 04.06)
    RTP
    A-bis/IP in IPA multiplex
    OML (GSM TS 12.21)
    RSL (GSM TS 08.58)
 .
 OsmoBTS is modular and has support for multiple back-ends. A back-end talks to
 a specific L1/PHY implementation of the respective BTS hardware. Based on this
 architecture, it should be relatively easy to add a new back-end to support
 so-far unsupported GSM PHY/L1 and associated hardware.