Your post says you want to use the T7316 phone. You did not say the T7316e phone. These phones should work on the DR5 but will not give you full function of the "e" phone. I will go out on a limb and say it will probably also work on the DR1 but still not with the added "e" functions. To get the added T7316e functions you need 6.1 software and I think the max s/w for the 3x8 is DR5 (5.1).
Someone will correct that if I am wrong.

And I do not think there is any label.
Probably have to go into the phone Admin to get s/w level.


If CON is the opposite of PRO
Then what is the opposite of Progress?