Aastra 9143i Series Administrator's Manual page 356

IP Phone Administrator Guide
Operational Features
IMPORTANT: If you change the functions of the Save and Delete keys, and then
an Administrator locks Keys 1 and 2, the functions are automatically set back to
the default settings of "Save" and "Delete".
Locking and Unlocking the Save and Delete Keys using the
Configuration Files.
Configuration Files
For the specific parameter you can set in the configuration files, see Appendix A, the section,
SAVE and DLETE Keys (6753i)"
5-52
Note: The Save and Delete functions are limited to Key 1 and Key 2 on
the 6753i IP phone only.
on page A-254.
"Locking the
41-001160-03 Rev 00, Release 2.5