Cisco Ip Phones 8851 And 8851Nr - Cisco 8800 Series Administration Manual

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The Cisco IP Phone 8841 and 8845 does not support the Cisco IP Phone 8800 Key Expansion Module.
Note

Cisco IP Phones 8851 and 8851NR

The following section describe the attributes of the Cisco IP Phones 8851 and 8851NR.
DC adaptor port (DC48V).
AC-to-DC power supply (optional).
AC power wall plug (optional).
Network port (10/100/1000 SW) connection.
IEEE 802.3at power enabled.
Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager
Cisco IP Phones 8851 and 8851NR
5 Access port (10/100/1000 PC) connection.
6 Auxiliary port.
7 Handset connection.
8 Analog headset connection (optional).
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