CUCM 11.5.1-15900-18, 1 Publisher, 6 Subscribers, 2 TFTP, 2 MOHI upgraded the firmware on my 78xx phones from sip78xx.12-5-1SR3-74 to 12-6-1-0001-668 and since then, I've received numerous complaints from contact center agents using 7841s of intermit...