I can answer one of the questions:
On Tue, Feb 12, 2019 at 12:17:40PM +0100, Gullik Webjorn wrote:
What does the "No Subscriber" mean, should
that be IMSI ?
Yes.
osmo-bsc doesn't know the subscriber's IMSI most of the time: the L3 containing
it mostly passes through. There is a message to officially tell osmo-bsc the
IMSI (Common Id) but so far we are not sending it from osmo-msc...
https://osmocom.org/issues/2969
~N