Unfortunately, we do not have any precise information on this. This headset is effectively not listed on the Swisscom website, but it could still fit. You would have to ask Swisscom directly.

As an alternative, we have this headset, which is optimised for Unify and not for Skype for Business.
Jabra Evolve 65 UC Duo incl. charging station (USB, Bluetooth, Wireless, Unify)