Can I Replace Just the Calisto Headet? What DCA Adapter do I need to send it with

Absolutely! Well, you could, but it has been DISCONTINUED

Calisto (headset only, DCA not included)

Product Code: PTR/CALISTO/MIC

P/N 77043-02 ($89.95 US, $119.95 CAD)

DCA Adapter for Calisto (headset only)

Product Code: PTR/DCA/VOYAGER

P/N 69522-01 ($19.95 US, $31.95 CAD)

That’s right! The Calisto headset can be charged using the same DCA as the Voyager 510, Discovery, and Explorer models.

Note: The Calisto Pro system uses a different power cord which connects to the Calisto phone base.