Cisco 8851 User Manual

The Cisco 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 includes features such as a built-in headset port, Gigabit Ethernet, Power over Ethernet (PoE) support, programmable line/feature keys, and support for video calls (with expansion module). 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. Using Phone Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Color display, handset, headset port, Ethernet ports, programmable keys, volume control, speakerphone.

Feature	Description
Display	5-inch color LCD with touch sensitivity
Handset	Wideband audio support for clear voice
Headset Port	3.5mm jack for wired headset connection
Ethernet Ports	Two 10/100/1000 Mbps ports (LAN and PC)
Power	Power over Ethernet (PoE) or external power adapter
Programmable Keys	5 line/feature keys (configurable)
Speakerphone	Full-duplex speakerphone with HD audio
Video Support	Optional expansion module for video calls
Security	Encrypted signaling and media (SRTP, TLS)
Networking	IPv4 and IPv6 support

Installation

Unpack and inspect contents. Place on stable surface.

Connect to network: Use Ethernet cable to connect LAN port to switch.
Connect PC (optional): Use second Ethernet port to connect computer.
Power the phone: Use PoE from switch or connect external power adapter.
Attach handset: Connect coiled handset cord to handset port.

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

First-Time Setup

Power on phone; follow on-screen prompts.

Network registration: Phone will attempt to obtain IP address and register with Cisco Unified Communications Manager.
Configure settings: Use phone menu or web interface to set language, time zone, ringtone.
Program keys: Assign line appearances or features to programmable keys.
Test call: Place a test call to verify audio quality and connectivity.

CAUTION! Do not expose to liquids or extreme temperatures.

Specifications

Display: 5-inch color LCD (480 x 272 pixels).
Audio: HD voice wideband audio; built-in speakerphone.
Network: Dual Gigabit Ethernet ports; PoE (802.3af).
Protocols: SIP, SCCP; IPv4/IPv6.
Security: 802.1X authentication, TLS, SRTP.
Power Consumption: 4.5W typical (PoE).
Operating Temperature: 32°F to 104°F (0°C to 40°C).
Supported Codecs: G.711, G.722, G.729, iLBC.

Controls and Settings

Access menu via phone buttons or touch screen. Front Panel: Handset, speakerphone, volume control, programmable keys.

Navigation: Use directional pad and soft keys below display.

Settings: Language, time/date, ringtone, screen brightness, network configuration. Programmable Keys: Assign lines, speed dials, call features (hold, transfer, conference). Audio: Adjust handset, headset, speakerphone volume; mute.

Connecting Devices

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

Turn off phone before connecting devices.
Match cables to ports (Ethernet to LAN, headset to headset port).
Power on phone after connections are secure.

Tip: Use shielded cables for best performance in noisy environments.

Using Phone Features

Supports basic and advanced call features.

Make call: Lift handset or press speakerphone; dial number.
Answer call: Lift handset, press speakerphone, or press Answer soft key.
Hold: Press Hold button to place call on hold.
Transfer: During call, press Transfer, dial target number, press Transfer again.
Conference: During call, press Conference, dial participant, press Conference again to merge.
Voicemail: Press Messages button or dial voicemail access number.
Speed dial: Press programmed speed dial key or use directory.
Call history: Press Recent button to view missed, received, placed calls.

WARNING! Do not use damaged handset cords; replace if frayed.

Accessibility Features

Visual alerts: Flashing LED for incoming calls. Audio adjustments: Customizable ringtone volume and patterns. Hearing aid compatible: Handset meets TIA-1083 standard.

Care & Cleaning

Unplug before cleaning. Use dry, soft cloth; mild detergent if needed. Avoid liquids on screen or ports.

CAUTION! Do not use abrasive cleaners; keep away from heat sources.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. ICES-003: Complies with Canadian EMI standards. CE marked: Meets EU directives. 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; try external power adapter; verify switch PoE capability.
No network registration	Network settings	Check IP address (Settings > Network); verify VLAN configuration; restart phone.
No audio	Volume/mute	Adjust volume; check mute status; ensure handset is properly connected.
Display blank	Power/brightness	Check power; adjust brightness in settings; restart phone.
Calls not connecting	Network/configuration	Verify SIP or SCCP configuration; check firewall settings; contact administrator.

Reset: Settings > Admin Settings > Reset if available (requires admin password).

Service: Cisco Technical Assistance Center; www.cisco.com/support