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Polycom devices use DHCP by default, it is assumed this has not been changed. Depending on your device license it will use option 160 (IP SKU) or option 161 (Lync/Skype for Business SKU). If you are not sure which SKU you have or have a mix then you can set both. Option 160 or 161 is not a standard option on most DHCP servers so you will need to add them (refer to your DHCP server documentation). The parameter will point to the Bridge server either as http://fqdn or http://Ipaddress if you choose to implement a secure connection between the phone and bridge then you will use https://fqdn. If you have changed the port that the bridge uses in the configuration then you can for example if it was change to port 8090 to set your DHCP option to http://fqdn:8090. Having set the options the next time the phone reboots or renews its lease it will connect to the UDM Pro Bridge and receive its configuration.
Now all the configuration is complete If you do not require to setup any of the more advanced bridge configurations in the following sections you can go to the EZ UDM Pro User's Admin Guide for how to setup your configuration.