Hello,
Martin O'Shield encouraged me to post the documentation I had started on OsmoCom integration with UmTRX, so here you go:
* https://github.com/shimaore/umtrx-osmo-bts which describes how to get started with the BTS side
* https://github.com/shimaore/umtrx-osmo-bsc which deals with the BSC side
Basically each of these contain a "how.txt" file on how to build the software, and a "start.sh" template script on how to start it.
Feel free to use github's Issues and Pull Requests to ask questions or suggest changes. S.