Can Poly Lens get my Blackwire 3320 call button working with 3CX?

Plantronics Hub is a workaround worth testing. In this setup, the older Hub software provided the local integration that 3CX was looking for, while Poly Lens alone did not. The headset button then answered and ended 3CX calls instead of opening Teams.

The catch is that Hub is discontinued, so weigh the risk of running unsupported software before deploying it broadly. This result applies to the setup described, not necessarily every Poly headset or 3CX version.

Try the Headset WebHID mode in the 3CX PWA if that option is available. It may let the browser handle headset controls without relying on the old Hub integration. It is worth a test with this particular headset, but there is no guarantee the button behavior will be the same.

The audio working does not necessarily mean call control is connected. 3CX is looking for a local Plantronics service, and a running Poly Lens Control Service does not by itself establish that the service 3CX expects is available.

When testing, check whether anything is listening on the local port named in the 3CX error. If it is not, that helps explain why 3CX cannot connect, though it does not establish a fix on its own.

If neither workaround is suitable, ask 3CX and Poly about supported call control for the PWA and this exact headset. Include the Teams variant, Windows version, and the Hub connection error so they can check the specific combination rather than just basic audio support.