Yealink T21PE2 linekey provisioning fails


we have an issue swith the EPM and Yealink T21PE2 phones.
The linekey.# is not provioned, the lines in the MAC.cfg stay factory default when a user logs in to the phone.
On the T48G and T42G on the same site all goes well.

linekey.1.line = 0
linekey.1.value =
linekey.1.pickup_value = **
linekey.1.type = 0
linekey.1.label =
linekey.2.line = 0
linekey.2.value =
linekey.2.pickup_value = **
linekey.2.type = 0
linekey.2.label =

Is anyone familiair with this?


No one???