The below information was provided by Poly/Plantronics tech support on 9/23/22 (Updated from 4/27/2022) regarding Nextiva SIP X-815, X-835 & X-885 phones.

For wireless headsets, you can use any Current Deskphone Compatible Headsets and Snom EHS wireless headset adapter.
***The Poly APP-51 EHS Cable in no longer considered a compatible solution which was originally recommended on 4/27/2022***
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$237.89
Poly Voyager 4245 Office Convertible Headset(Desk Phone + PC + Mobile) & Teams VersionSelect options
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$261.34
Poly Savi 7210 Wireless Headset | Poly 213010-01 or HP 7W6D4AA#ABA(Desk Phone)Add to cart
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$307.36
Sale!
Poly Savi 8220 Office Wireless Headset(Desk Phone + PC + Mobile) & Teams VersionSelect options
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$240.01
Poly Voyager 5200 Office 1-Way Headset | Poly 212722-01 or HP 7W6D2AA#ABA(Desk Phone + Mobile)Add to cart
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