After completing an upgrade to Expressway 8.8.1, it was noticed that Mobile and Remote Access (MRA) suddenly stopped working. After some searching and log files, it was found to be a DNS PTR record issue. The implemented “feature” that required the Expressway-E DNS PTR resolution had only been implemented as a requirement in version 8.8.1.
I was working through a factory reset process on my Cisco 8945 phone and after the reset completed successfully, the phone attempted to download the latest firmware version from the device defaults page. The phone froze after powering on each time. Like usual, the fix was pretty straight forward.