Do you have a packetfence of any kind and/or connect with a TLS connection? And did you update the TLS certificates? Are you able to http into any of the devices?
I have like 8 Trio 8800s in various rooms around the country and they all give me issues like this. Poly's devices are too advanced and picky. I highly recommend switching to Neat instead since you virtually never have to do any kind of advanced support for them. Anyway, if you haven't done so, I'd use the link below to update the TLS certificates since that's one thing I had to do to get all my Trios working. If you http into them, you can go to Settings>Network>TLS and paste the .pem for the SHA2 Secure Server into Application CA 6 and paste the .pem for Global Root CA into Application CA 7, then reboot the device under Utilities>Reboot.