cisco cp 8851 phone manual

The Cisco CP 8851 is a full-featured IP phone designed for business environments, offering high-quality audio, a color display, support for multiple lines, and integration with Cisco Unified Communications Manager. It features Power over Ethernet (PoE), Gigabit Ethernet ports, a built-in headset port, and support for various call features including hold, transfer, conference, and voicemail. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Advanced Call Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Color display, handset, keypad, Ethernet ports, headset port, and programmable line/speed-dial keys.

FeatureDescription
DisplayBacklit color LCD for call information and menus
HandsetWideband audio capable for high-quality voice
Keypad12-button dial pad with illuminated keys
Ethernet PortsTwo 10/100/1000 Mbps ports (LAN and PC)
Headset Port3.5 mm port for wired headset connection
Line KeysProgrammable for multiple lines or speed dials
SpeakerphoneFull-duplex for hands-free conversations
Power SourcePower over Ethernet (PoE) or optional power adapter
HoldPlace calls on hold
ConferenceMerge multiple calls into a conference

Installation

Unpack and inspect contents. Place on stable surface.

  1. Connect to network: Use Ethernet cable to connect phone's LAN port to switch.
  2. Connect PC (optional): Use second Ethernet cable from phone's PC port to computer.
  3. Connect handset: Plug coiled handset cord into jack on phone.
  4. Power on: Phone receives power via PoE or connect optional power adapter.

WARNING! Use only approved power sources. Ensure cables are securely connected.

First-Time Setup

Phone boots and registers with Cisco Unified Communications Manager.

  1. Network registration: Phone obtains IP address via DHCP and contacts CUCM.
  2. Verify registration: Check for extension number on display.
  3. Set preferences: Use Settings menu to configure ringtone, volume, display contrast.
  4. Program keys: Assign line keys or speed dials via phone web interface or CUCM.

CAUTION! Do not disconnect during boot process. Ensure network connectivity.

Specifications

Controls and Settings

Access menu via NAVIGATION button. Front buttons: MUTE, HEADSET, SPEAKERPHONE, VOLUME.

Softkeys: Context-sensitive buttons below display for call functions.

Settings: Ringtone selection, display contrast, time format, network configuration. Audio: Volume controls for handset, speaker, ringer. Network: View IP address, subnet, gateway. Security: Configure authentication and encryption settings.

Connecting Devices

Network: Ethernet to switch. PC: Pass-through to computer. Headset: 3.5 mm plug.

  1. Turn off devices before connecting cables.
  2. Match Ethernet cables to correct ports (LAN, PC).
  3. For headset, plug into dedicated port on side of phone.

Tip: Use quality CAT5e or higher cables for Gigabit Ethernet performance.

Advanced Call Features

Supports hold, transfer, conference, forward, and voicemail.

  1. Make call: Lift handset or press SPEAKERPHONE, dial number.
  2. Hold: Press Hold softkey during active call.
  3. Transfer: Press Transfer, dial target number, complete transfer.
  4. Conference: Press Conference, dial participant, merge calls.
  5. Forward: Configure call forwarding via phone menu or CUCM.
  6. Voicemail: Press Messages key or dial voicemail access number.
  7. Speed dial: Program keys for one-touch dialing.
  8. Call history: View missed, received, and placed calls.

WARNING! Ensure proper configuration for transfer and conference to avoid dropped calls.

Accessibility Features

Visual alerts: Flashing LED for incoming calls. Audio adjustments: Volume boost for ringer and handset. TTY support: Compatible with teletype devices.

Care & Cleaning

Unplug from power before cleaning. Use soft, dry cloth; avoid liquids and abrasive cleaners.

CAUTION! Do not spray cleaners directly on phone. Keep away from excessive moisture.

Regulatory Information

FCC Part 15: Class A digital device; complies with limits for business use. CE marked for European compliance. Copyright © Cisco Systems, Inc. For support, visit www.cisco.com or contact Cisco Technical Assistance Center.

Troubleshooting

SymptomPossible CauseCorrective Action
No display/powerPower sourceCheck PoE switch or power adapter connection; verify cable.
No network registrationNetwork/DHCPCheck Ethernet cable; verify DHCP server; restart phone.
No audioVolume/muteAdjust volume; check mute status; verify handset connection.
Calls not completingConfigurationVerify CUCM registration; check dial plan configuration.
Poor audio qualityNetwork/deviceCheck network latency/packet loss; replace handset if damaged.

Reset: Press and hold # key during boot for factory reset (caution: erases configuration).

Service: Contact Cisco TAC or authorized service provider.

cisco cp 8851 phone manual © - All Rights Reserved 2025