NEC Electra Elite - where is "headset button?"

This set is a NEC Electra Elite DTU-16D-2 (BK) and has both a "handset" and "headset" jack. The pamphlet says that one can use a headset in the headset jack by pressing the "headset button" on the set. But I can find no such button.

What am I missing here? If one of the soft keys needs to be programmed as a "headset" button, can anyone describe how to do this? The pamphlet says nothing about it, and the system programming manual is gone, nach.


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