Got 1/16 version. As you mentioned first incoming call I get no ring, I also get no voice from phone to the caller. After the first call it seems to work every time, made a number of calls. Voice quality seems to be good. Speaker phone/mute work fine. After a reboot the same thing occurs on first call and works after. I guess it's a good way to tell if I have a spontaneous reboot that I didn't notice.
Other stuff I've tested so far looks good. Thanks for the release! My wife about to force me off the 12/24 load... hehe