"The best business telephones in the world."

Hi folks, 

I bought the PA1 to set up with my IP phone with a loud speaker. I have a large greenhouse and can't hear the phone ring unless we are right next to it. The PA1 I bought did not come with a power supply so I was hopping that the POE would power it. The powers light isn't coming on?? I thought is was defective and I send the first one back but the replacement is doing the same thing. Am I  going to have to get a SNOM 5v DC ps? 

What am I doing wrong?