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.

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Microsoft Lync Server 2010 includes the Device Update Web service, which is automatically installed with Web Services.

You can use this service to download updates from Microsoft, test them, and then deploy the updates to all the IP phones in your organization.

Publishing websites typically requires the following reverse proxy certificates: Subject Name = External Web Farm FQDN (for example, ocsrp.contoso.com) If the device is outside the organization’s firewall, and the user is not signed in, the Device Update Web service denies the request.

When the update is complete, the device uses the update as its current version, and the previous version is stored in the firmware as a backup.

The device goes back to the backup tested update, which is always stored on the device as a backup.

Introducing new device models Make available all software updates relevant to a new model of an IP phone that is being introduced to the market.If the device is outside the organization’s firewall, and the user is signed in, the Device Update Web service returns a response indicating that anonymous access is not supported.The device then sends an HTTPS update request over port 443 to the Device Update Web service.An update file contains updates for one or more unified communications (UC) devices.After obtaining the file, you upload it to Device Update Web service by using the Lync Server Management Shell.Test, and then approve or reject, specific updates for deployment to your organization’s IP phones to make sure that all updates are valid and functional, instead of having to troubleshoot after deployment.