In the Cisco Unified CM portal, navigate to User Management > End User > Add New.

Create a User ID, Password, and Self-Service User ID (This will be the TD52’s extension you will use in step 3.) We recommend setting the Last Name as the User ID.

Ensure that your Digest Credentials are the same as the password you defined.

The PIN is irrelevant for the integration to work, but must be set to something. As long as the field is non-empty we’re ready to move to the next step.

In the Cisco Unified CM portal, navigate to Device > Phone > Add New.

For phone type, select Third Party SIP Device (Advanced).

After saving, you'll be directed to the device's configuration page. Navigate to the Device Information section.

Enter the media access control (MAC) address of your TD52. Find the MAC address on the back of the device or, in the device’s settings. Copy the rest of the settings shown above, making sure you select the Owner User ID that corresponds to the end user you created in step 1.
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Scroll down to Protocol Specific Information and copy the settings (as shown below). Be sure to select the Digest User that matches the end user you created in step 1 and the Owner User ID you created in step 2.

In the Association window, click Add a New DN and navigate to the Directory Number Information section.

Copy the extension (defined in step 1) and paste it in to the Directory Number field.

Navigate to your TD52's Settings page and scroll to the Call section.

Click Add Account. You should be redirected to the SIP Account configuration menu.

Verify that your Authentication Username exactly matches the End User ID/Owner User ID/Digest User that you configured in steps 1, 2 and 3.

In the Domain/Server field, type your SIP domain. Note: The default port is 5060, but you can change it by appending a custom port number; for example, cucm.example.com:5061.

Fill in the User ID and Password fields with the values created in step 1 and click Save. If provisioning was successful, you’ll see a green checkmark under SIP Account in the Device settings.

Navigate to your TD52's Receivers tab.

Click the plus (+) icon and select SIP Phone.

Enter the extension of the recipient you want to add to the call list. When someone presses the call button, the call will be routed to the specified SIP extension. Alternatively, to call the intercom from your SIP device, simply dial its extension.