Panasonic KX-T336 System Reference Manual page 208

Conditions for Assigning the MESSAGE button
. KX-T1232XX series PITS's:
The MESSAGE button cannot be assigned, for
these PITS's are already provided with the
MESSAGE button.
l
KX-T616XX series PITS's:
Assignable to the DN-06 button only.
DN-06 button
CM button
l
KX-T30820, KX-T30850
Assignable to the DN-03 button only.
DN-03 button
k .- ..ICM ,
button
l
KX-T30830
Assignable to the DSS 8 button only.
.
.
II
.
.
s
.
is
DSS 8 button
ICM button
9-G-5