Anyone tried this combination? Does the power output on the one PoE port of the UBNT ER-X properly power the PoE input on a Yealink phone? We are specifically looking at the T42S.
The ERX should work if the power injector that you’re passing through is one design for the phone and not the fixed voltage unifi
The ER-X models have warnings in the manual that you need a different power source than the included wall wart if you're going to provide PoE to a device. At that point, just use passthrough from a compatible phone adapter.
@JaredBusch already nailed it.