I recently updated to RPi2-3 Version 1.5rc2 (complete format and reinstall), and noticed the PTT line gets stuck in transmit upon boot of the Pi 3 until I 'kerchunk' the system. I can toggle the PTT form the asterisk CLI no problem. Is anyone else having this issue? Interface is a USB sound FOB. Duplex=0 -- 73, Joe KG6NRI