In the Replicant contributors meetings of July 2019, there is a presentation on the oFono RIL:
Replicant and oFono based Java RIL
You can watch the talk and read the slides here: https://redmine.replicant.us/projects/replicant/wiki/ContributorsMeetingJuly2019#Presentations
1 From #replicant, the 22 February 2020:
< scintill[m]> Hey all. I've been working again on the RIL for Note 2 LTE, and eventually other Qualcomm modems. I've got data working a few times, but it's not reliable. I'm looking into issues with audio calls too. It seems, for some reason, ofono doesn't get an acknowledgement that a dialed call has started.