I had a pair of Polycom VVX300 sitting here from an old 8x8 account. I was able to factory reset them and get into the GUI to set the phone up but for the life of me I can't get this thing to make or receive calls. I never could get it to pull the registration direct from my 3CX server. This is kind of a summary of where I am. The VVX300 and 3CX server are on the same LAN The DHCP server does NOT provide any way for the Option66 setup. I changed the DHCP option to static within the VVX300 settings page and pointed it to the 3CX server. At this point it pinged 3CX and 3CX shows it on the phone listings. I can add the phone to a test line and it will show as active and connected but does NOT appear to push or pull any provision from 3CX. Within the VVX300 web portal I can't get it to PULL a firmware from the provision link provided from 3CX either. Just says the server isn't found. The firmware files were downloaded from Polycom and placed in the correct 3CX folder. Tried the direct IP, the FQDN from 3CX, etc... Nothing I was able to get the phone to pull the 5.6.0 firmware directly from Polycom to at least get it up to the current approved firmware level but it still will not make or receive calls. Anyone using one of these VVX phones on 15.5?