And what exactly does that have to do with Digitec? Do you think they take the power supply out of every box or what? Complain to Yealink, or send it back to Digitec as a bad buy, or buy a PoE switch and that's it... Don't get upset, it's bad for your blood pressure!

I completely agree. No power supply unit is absolutely unacceptable. If delivered without a power supply unit, this should be clearly stated in the item description.

Good afternoon to all,

We have exactly the same telephones and I am quite satisfied.
It should be added that they are IP telephones that are powered via the network.
With older technical equipment, an external switch is needed.