Not sure if there's a bug in this version. When simple configuration changes are made on IP phones in version 8.5 are made, as soon as the changes are saved, the phones reset. I know if older UCM versions you have to manually reset or resetart the phones.
"You do not have to reset a Cisco Unified IP Phone after you add a directory number or update its settings for your changes to take effect. Cisco Unified Communications Manager automatically performs the reset; however, you can reset a Cisco Unified IP Phone at any time by using the following procedure."
Difference between reset and restart:
Reset—Shuts down the device and then restarts the phone
Restart—Restarts the device without shutting down the phone.
Thank you for your prompt reply. I recall a change such as text label would not reset the phone unless you manually updated the phone set. However, in this version the phone resets as soon as you "save" your change.
After making the changes in the Line Text Label as you said, the line will reset automcatically after you click SAVE. Please Note, this only resets the line not the phone. The same was with older version of CUCM like 7x and 6x.
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