This is at a customer premises so it is hard to get exact information, but I can tell you that after we recently updated the names on a couple of extensions and then reprovisioned the phones (by using the Reprovision feature of the web admin control panel on the Phones page) the resulting update to the phone was not correct. For example, we updated one extension (x102) with a new name and the resulting phone display after reprovision shows the old name for the extension (x102) but replaced the next extension BLF (which should have been x103) with the new name for the extension (x102) and the next extension (which should have been x103) is completely missing from the display even though it is set properly in the BLF fields in the control panel. This information was sent to us in pictures so it has been verified.