Upgrading Polycom CX series phones for Lync Server

Step 1: Obtain the latest updates from Microsoft website, Store the .cab file in C:\Polycom
Step 2: Find the web server identity in pool

• Get-CsService

Step 3: Construct the command in notepad

Import-CsDeviceUpdate -Identity "service:xxxxxxxx" -FileName C:\Polycom\UCUpdates.cab

Step 4: Run it in Lync Server Management Shell

Step 5: Verify import in Lync control panel

Step 6: Approve it after hours.

The Device Update Process

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The device update process begins with you downloading an update from the Microsoft website, and then using the Lync Server 2010 Control Panel to test, approve, or reject the update. Approved updates become pending updates that devices retrieve by using the following process.
The first time a user starts an IP phone and signs in, the device gets information by using in-band provisioning from the server. The information contains the internal URL of the server running the Device Update Web service.
If the device is turned on, but no user signs in, and no user has ever signed in on the device, then the device sends a DNS lookup request to ucupdates-r2.<DNSDomainNameProvidedByDHCP>, and obtains the internal URL of the server running the Device Update Web service.
The device checks for updates every time it is turned on, every time the user signs in, and every 24 hours, by default. It checks by sending an HTTP request over port 443 to the Front End Server that hosts the Device Update Web service. The request includes the current version of software that the phone is running, and the response is determined by the device and whether there is a new update on the server to download.