This docker image was created using the official nodered custom build tutorial.
This image is identical to the official one, but it's built using debian-slim instead of alpine, so it uses glibc instead of musl libc.
If you don't know what does this implies, then you probably should stick to the official nodered image.
For parameters, see https://github.com//node-red/node-red-docker.
Just run
cd docker-custom
./docker-debian.sh
This is a custom version on the default image, which just adds baresip as internal command.