I have installed a pro version for 3CX Version 15.5.3849.1. I have some Fanvil phones the X3SP and X5S. I've installed the PBX successfully and plugged in the phones onto the network. The phones are receiving IPs via DHCP successfully and I can enter the web interface for the phones. However when I go to the phones page I cannot see the phones.The X3SP firmware version is 188.8.131.5259. The X5S firmware version is R.0.5.2. The switches are the cisco catalyst 3750. I have tried everything including restarting the PBX and the phones but no success. My network is 172.16.0.0 /16. I am using windows server for DHCP. Anyone had a similar problem?