cisco model 8851 manual

The Cisco Model 8851 is a high-quality IP phone designed for business environments, featuring a large color display, support for multiple lines, advanced audio capabilities, Power over Ethernet (PoE), and integration with Cisco Unified Communications Manager. Below are key sections covering safety, features, installation, configuration, operation, and troubleshooting.

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

Features at a Glance

Key components: Large color display, handset, keypad, Ethernet ports, headset jack, and built-in speakerphone.

Feature	Description
Display	High-resolution color screen for call information and menus
Handset	Wideband audio for clear voice quality
Keypad	Backlit keys for easy dialing in low light
Ethernet Ports	Two 10/100/1000 Mbps ports for network and PC connection
Headset Jack	3.5 mm jack for wired headset connectivity
Speakerphone	Full-duplex speakerphone for hands-free conversations
Power over Ethernet (PoE)	Receives power through Ethernet cable (IEEE 802.3af)
Programmable Line Keys	Customizable keys for speed dials and features
Volume Control	Dedicated buttons for adjusting handset, speaker, and ringer volume
Hold/Resume	Button to place calls on hold and resume them

Installation

Unpack and inspect contents. Place phone on stable surface.

Connect to network: Use Ethernet cable to connect LAN port to switch or router.
Connect PC (optional): Use second Ethernet port to connect computer.
Connect handset: Plug handset cord into handset port.
Connect headset (optional): Plug into headset jack.
Power on: Phone receives power via PoE or optional power adapter.

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

First-Time Setup

Phone boots up and registers with Cisco Unified Communications Manager.

Network configuration: Obtain IP address via DHCP (default).
Register with CUCM: Phone automatically attempts registration; check extension assignment.
Set preferences: Use phone settings menu to adjust language, time zone, ringtone.
Test call: Place a test call to verify audio quality and connectivity.

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

Specifications

Display: 5-inch color LCD with backlight.
Audio: HD voice wideband audio, built-in speakerphone.
Network: Dual 10/100/1000 Mbps Ethernet ports, IEEE 802.3af PoE.
Protocols: SIP, SCCP support.
Power: PoE (IEEE 802.3af) or optional 48V DC power adapter.
Supported Codecs: G.711, G.722, G.729, iLBC.
Operating Temperature: 32°F to 104°F (0°C to 40°C).
Dimensions: 8.5 x 10.2 x 6.3 inches (216 x 259 x 160 mm).

Controls and Settings

Access settings via phone menu or web interface. Front Panel: Display, soft keys, navigation cluster, volume buttons.

Soft Keys: Context-sensitive for call functions (Answer, End Call, Hold, Transfer, etc.).

Phone Settings: Language, time/date, ringtone, screen contrast, network configuration. Call Features: Call forward, call waiting, do not disturb, speed dials. Audio Settings: Volume levels for handset, speaker, ringer; audio mode (wideband/narrowband).

Connecting Devices

Network: Ethernet cable to LAN port. PC: Connect to PC port. Headset: 3.5 mm jack.

Turn off phone before connecting devices if not using hot-plug.
Match cables to correct ports (Ethernet to LAN, handset to handset port).
Verify connections by checking link lights on Ethernet ports.

Tip: Use certified Ethernet cables for optimal performance.

Using Phone Features

Supports basic and advanced calling features.

Make call: Lift handset or press Speaker, dial number, press Dial soft key.
Answer call: Press Answer soft key or lift handset.
Hold call: Press Hold button; resume with Resume.
Transfer call: Press Transfer, dial target number, complete transfer.
Conference call: Press Conference, dial participant, merge calls.
Speed dial: Assign numbers to programmable line keys.
Voicemail: Press Messages button to access voicemail.
Call history: Press Directories to view missed, received, placed calls.

WARNING! Do not expose phone to liquids. Use approved accessories only.

Accessibility Features

Visual Alerts: Flashing LED for incoming calls. Audio Adjustments: Adjustable ringer volume and tone. TTY Support: Compatible with teletype devices. Large Font: Option to increase text size on display.

Care & Cleaning

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

CAUTION! Do not spray cleaners directly on phone. Keep away from extreme temperatures.

Regulatory Information

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

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	PoE/Power adapter	Check Ethernet cable for PoE; verify power adapter connection.
No network connectivity	Cable/DHCP	Check cable and link lights; verify DHCP server is reachable.
Phone not registering	Configuration	Check CUCM configuration; verify IP address and subnet mask.
No audio	Volume/Handset	Adjust volume; check handset connection; try headset.
Display issues	Settings/Cable	Adjust contrast; reboot phone; check internal connections.

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

Service: Contact Cisco TAC or authorized service provider.