I need some help getting this feature to work. I just received a bunch of Yealink T-28P phones and plugged them in to the network and manually changed the VLAN to my voice VLAN. The phones now have a DHCP address and are on the same VLAN as 3CX. The server can ping the phones just fine but none of the phones are showing up automatically in 3CX. I am running SP5 and I have tried firmware 18.104.22.168(came on phone) and 22.214.171.124 (latest). I have 20 new phones connected but none are listed as NEW under the "Phones" menu in 3CX. Any ideas on getting them to show up? I've turned the Windows firewall off on the server. Thanks!