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Clear, reliable Cisco voice calling for small and mid-sized businesses on hosted voice.
The Cisco IP Phone 6851 (CP-6851-3PCC-K9) is a desk phone with a 3.5-inch backlit grayscale (396×162) display, 4 programmable line keys and a 2-port 10/100/1000 Ethernet switch with PoE Class 2. It runs Multiplatform (MPP) firmware and suits small and mid-sized businesses on hosted voice.
Why Businesses Replace Analog and Softphone-Only Setups with Cisco IP Phones
Analog phones need separate cabling and lack modern features, while softphones depend on headset quality and computer performance. Teams that take many calls need a dedicated device that is always ready and sounds clear.
The 6851 connects over the same Ethernet network as your computers and can be powered by PoE, so one cable carries voice, data and power. Its built-in switch lets a PC connect through the phone, saving switch ports and cabling.
It runs Cisco Multiplatform (MPP) firmware for hosted and third-party SIP call control platforms such as Webex Calling, BroadWorks and other SIP services.
Display and Line Management
The 3.5-inch backlit grayscale (396×162) display shows caller details, call status and menus, and 4 programmable line keys give quick access to lines, shared lines and speed dials.
Network and Power Efficiency
2-port 10/100/1000 Ethernet switch, PoE Class 2 keeps desk cabling simple. PoE support means the phone can be powered by a PoE switch, so no separate power adapter is needed at the desk.
How to Set Up the Cisco IP Phone 6851
- Connect the phone’s network port to a PoE switch port (or use the optional power supply), and connect your PC to the phone’s PC port.
- Attach the handset and stand, then wait for the phone to start and obtain an IP address.
- Register the phone with your hosted or SIP call control provider using MPP provisioning.
- Test inbound and outbound calls, set the ring tone and volume, and update firmware from the call control platform.
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