supa We do not develop asterisk, we only package it. As such, you won't see it on github or activity in github in that regard. It is just a packaging effort: we use source from Digium and package it in rpm format, make DAHDI work as DKMS modules so you can use it on netinstalls, make sure libtonezone, libpri, sounds, and many other dependencies are met, etc. It is not a simple task, and takes a lot of time.
As for activity, I would ask you to check again on github, IssabelFoundation, you will see there is activity regarding actual Issabel code, and its updates (there were updates 4 hours ago, 19 hours ago, 4 days ago, etc... it is not correct to say there is no activity):
It would be great if you can help us by reporting bugs, and probably fixing them and, submitting pull requests on github.