We recommend creating the following DHCP Options on your network:
Option 160: http://cfg.voice.dynmx.net/cfg
Option 66: cfg.voice.dynmx.net
** Note that some phones such as Cisco 79x0 models prefer an IP address rather than a hostname **
Polycom Provisioning Example
Polycom Phones have the factory default (depending on the Software Version) Custom+Opt.66. The Phone first looks for an Option 160 reply from the DHCP Server and then for the Option 66.
Custom = DHCP Option 160
Opt.66 = DHCP Option 66