A button must be programmed as a "headset" key. When activated, it will lamp red, and put the conversation on the headset jack under the phone (next to the handset jack).
Or you can purchase a headset with an auto lifter for the handset. It picks up the handset enough to answer the call, but transfers the conversation to your headset.
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how do you program a button to be a 'headset' key?
But HOW do you programme it!!
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