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The Cisco 6851 is a SIP telephone which will work across most VoIP telephony Platforms. These SIP telephones will require provisioning. Your VoIP telephony service provider will be able to assist you.
This is a Power Over Ethernet (PoE) enabled device and, as such, is sold without a PSU.
If you do not have PoE, you will need to purchase a separate Power Supply Unit.