Updates are uploaded to Device Update Web service in the following manner:

1. The administrator downloads updates in .cab files from the Microsoft Help and Support website, and then uploads the .cab files to the Device Update Web service by using the Device Update Web service on the Microsoft Lync Server 2010 Control Panel.
   
   
2. The Lync Server 2010 Control Panel retrieves all device-specific updates from the .cab file. It writes the data to the Windows Management Instrumentation (WMI) data store and writes the update files to the Device Updates folder.
   
   
3. Device Update Web service on the Lync Server Control Panel publishes the updates on the Pending Updates tab.
   
   
4. When the administrator performs any operations on the updates in the list, the Lync Server Control Panel writes any changes to the WMI store.
   
   

Device Update Web service supports Microsoft Lync 2010 Phone Edition

1. The first time a user starts Lync 2010 Phone Edition and signs in, the device gets in-band provisioning information from the server or Front End pool hosting the device user account. The information contains the internal and external URL of the server running Device Update Web service.
   
   If the device is turned on, but no user signs on and no user has ever previously signed on to the device, the device sends a Domain Name System (DNS) lookup request to ucupdates-r2.<DNS domain name that was provided by DHCP> and obtains the internal and external URL of the server running Device Update Web service.
   
   
2. Thereafter, when the device is turned on, when the user signs in, and every 24 hours by default, Lync 2010 Phone Edition checks for updates by sending an HTTP request over port 443 to the server hosting Device Update Web service. The request includes the current version that Lync Phone Edition is running.
   
   
3. If a user has not signed on to the device, and the device is outside the organization’s firewall, Device Update Web service denies the request.
   
   
4. Otherwise, Device Update Web service returns a response containing one of the following:
   
   
   • If no approved updates exist for the current version of the firmware, the response contains downloads=0. For test devices, updates must be pending rather than approved for this to occur.
     
     
   • If an approved update exists for the current version, the response contains an internal and external URL for Device Update Web service. For test devices, updates must be pending rather than approved for this to occur.
     
     
5. In the latter case, Lync Phone Edition sends an HTTPS update request over port 443 to Device Update Web service. If the device is outside the organization’s firewall, this request must include a user name and password for a valid user account, which means a user must be logged on to the device.
   
   
6. The update image is downloaded to the device.
   
   
7. The device waits for five minutes of idle activity, and then restarts to complete the update.
   
   

Tip:
The System Information screen on the device displays the current version and the date of the last update.