Image versions 5.x and later accept only signed binary files, which improves security on the Cisco IP Phone 79. Image versions earlier than 5.x accept unsigned binary files. sbn extension, while unsigned images have a. Image authentication is performed through signed binary files. There are two types of images that are used on the Cisco IP Phone 79: signed and unsigned images. Background Information Signed and Unsigned Images (Image Authentication) Refer to the Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software and hardware versions, but applicable to all Cisco CallManager Express releases and Cisco IP phone loads:Ĭisco IOS? Router on Cisco IOS? Release 12.4(4)T with Cisco CallManager Express Release 3.4(0) Prerequisites RequirementsĮnsure that you meet these requirements before you attempt this configuration:Ĭisco IP phones are currently registered with Cisco CallManager Express. This document provides the procedure for how to upgrade Cisco IP phone firmware with Cisco CallManager Express.
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