Panasonic KX-TD816 Programming Manual page 242

2.7 Extension Programming
• To assign all jacks to one selection, press the
the contents programmed for Jack 01.
• Immediately after changing your assignment, the changed setting may not work for a
maximum of eight seconds.
Features Guide References
EXtra Device Port (XDP)
242
key in step 3. In this case, the display shows
General Programming