Panasonic KX-T336 System Reference Manual page 1033

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.
• KX-T616XX series PITS's:
Assignable to the DN-06 button only.
• KX-T30820, KX-T30850
Assignable to the DN-03 button only.
• KX-T30830
Assignable to the DSS 8 button only.
DN-06 button
ICM button
DN-03 button
ICM button
DSS 8 button
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ICM button
9-G-5