Verified this error by GSMTAP using mncc-python interface OsmocomBB to network
Proposed Changes:
In case of MO call (_onmncc_setup_req) caller needs to provide bearer_cap speech version
Added mncc.bearer_cap in mncc_sock.py based on codecs = GSM48.AllCodecs
Added new field mncc.MNCC_F_BEARER_CAP in mncc.MNCC_SETUP_REQ, when call is initiated (MO) from MS -> network
Change-Id: If77851b86111d62d82221a886ed2391179080cca
For manual testing the osmo-sip-connector it is nice to run a custom
MNCC server to mock certain behavior. Refactor the socket class to
share code between client/server.
Change-Id: I8387fe1687557c6a1a26ff1e0cc9dbff3087aa82