We have a mixed environment of phones. Yealink T46G, Polycom IP6000 and Cisco 7940's. We use Vlans, DHCP options and TFTP to pass config to phones. we upgraded from 12.5 to 15.5. In 12.5 - 3cx would generate the config file and place it in c:\programData\ 3cx......provisioning\wfu3g0ga2x\ after...