I have a Polycom VXX 601.
At first, it receives the configuration and worked just fine for about 1 week.
But now, it does not want to boot.
After plugin the RJ45 cable (on a PoE switch), the telephone start to boot, the buttons light up.
And it stays like that...
No buttons work.
Could you help me please?
Siphon Networks Ltd sold this back in 10/2019 and they are your Tier 1 support.
They can open a ticket for you or RMA the unit.