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You connect the A10 adapter to the headset port on the bottom of the phone, then program a Headset key on the phone. Once you toggle the Headset mode on, you use the speaker button as the onhook/offhook toggle for the headset.
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Yeah, I tried that and it doesn't work with the Plantronics HX540 headset, but it does work with the GN Netcom headset...