I noticed for the Cisco 6825 phone there are two firmware versions (as below) -- this appears to be the same naming convention where one has RGD and the other does not. I tried my best to work out what this means, but could not. The two advisories they points to are exactly the same.
I am aware there is a ruggedized version of the phone -- is this the difference. I could not see this mentioned in any of the notes unless I missed it. Could anyone confirm and is there anywhere I can always clarify the basic question of what firmware applied to which model/variant of phone?