From Snom User Wiki
Enabling support to automatically detect and provision Snom phones can be performed automatically by Objectworld’s Server Configuration Wizard (SCW). When UC Server is installed, the installer application will prompt the user to configure the server.
Each step in the SCW launches a wizard-style application that will prompt the user with site-specific questions. One of these wizards is called the “Phone Types Wizard”. It is through this wizard that support for Snom telephones can be enabled.
Clicking on “Phone Types” will reveal a Welcome message, followed by a dialog that displays the models/types of phones for which support can be enabled automatically. The Snom 300, 320, 360, and 370 phones are all available for automatic detection and provisioning.
Select all of the Snom models that apply to your site. If you anticipate having a particular model but do not have any presently connected to your network you can choose to enable support for them now or at a later date (by running the Server Configuration Wizard again).
The following dialog will present configuration options for the Windows Firewall. If your firewall is enabled and exceptions are allowed then you must configure the firewall to allow TFTP transactions. The option to automatically configure the Windows Firewall for TFTP service is enabled by default.
Should Windows Firewall exceptions be disallowed because of a domain security policy then you must ensure that the policy either includes the TFTP service exception or allows the machine hosting UC Server to enable exceptions. Should this be the case and manual intervention is required then the following application must be included in the Windows Firewall exception list:
where %Install_Directory% is the path where UC Server is installed.
The following dialog describes the only manual intervention required for enabling support for provisioning phones: the configuration of the DHCP server. The dialog reveals which DHCP option needs to be modified, and the IP address that needs to be set for that option.
The following dialog reveals a summary of the actions that will take place once “Submit” is clicked. In the example dialog below, support for the 300, 320, 360, and 370 will be enabled.
Clicking “Submit” will then show a dialog that displays the configuration progress.
Once this wizard completes successfully, users will be able to connect Snom phones to the network and they will be automatically detected by UC Server. The corresponding phone will appear in the administration user interface, where the administrator can assign identities to the phone. This will cause the phone to be automatically updated with this new identity, without any manual intervention required. Below is a sample of what the administration user interface might look like with two Snom phones connected; one has two identities assigned to it, the other has just been connected to the network and has not yet had any identities assigned to it.