Panasonic CPC-EX - Manual (Page 167)

Section 300-Installation Appendix A. EX 1.0 Feature Update
DBS-2.3/9.2-300 DBS Manual - Revised April 2000 Page A-7
8. Slide the handset guide out, rotate 180° so that the holding clip is exposed, and reinsert.
Figure A-4.Handset guide insertion for wall mounting, key telephone
44-Series Enhanced Phone Features
Note: The enhanced features introduced with these phones are supported by CPC-EX
Version 1.0, CPC-AII/B Version 8.0, and CPC-S/M Version 2.0. You can also
use the 44-Series phones with previous DBS versions, but the enhanced
features won’t be supported.