Cisco IP Phone 9841 Manual

The Cisco IP Phone 9841 is a high-quality business IP phone featuring a large color display, support for multiple lines, advanced call handling features, Power over Ethernet (PoE), and integration with Cisco Unified Communications Manager. 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: Large color LCD display, Handset, Speakerphone, Ethernet ports, Headset jack, Volume controls.

Feature	Description
Display	High-resolution color LCD with backlight
Handset	Full-duplex speakerphone with noise reduction
Ethernet Ports	Two 10/100/1000 Mbps ports for network and PC connection
Headset Jack	For wired headset connection (optional)
Power	Power over Ethernet (PoE) or external power adapter
Programmable Line Keys	Multiple line appearances and feature access
Volume Controls	Separate controls for handset, speaker, and ringer
Message Waiting Indicator	LED for visual voicemail notification
Hold/Resume	Single button for call hold and resume
Conference	Easy conference call setup

Installation

Unpack and inspect contents. Place on stable surface.

Connect to network: Use Ethernet cable to connect phone to switch port.
Connect PC: Use second Ethernet port to connect computer.
Connect handset: Plug handset cord into phone base.
Power on: Phone will boot via PoE or external power adapter.

WARNING! Use only approved power sources. Ensure network cables are properly seated.

First-Time Setup

Phone will automatically register with Cisco Unified Communications Manager.

Network configuration: Phone obtains IP address via DHCP.
Firmware download: Phone downloads latest firmware from TFTP server.
Extension assignment: Administrator assigns directory number to phone.
User configuration: Set up speed dials, ring tones, and preferences.

CAUTION! Do not disconnect power during firmware update.

Specifications

Display: 5-inch color LCD, 480 x 272 pixels.
Network: 10/100/1000 Mbps Ethernet, IEEE 802.3af PoE.
Audio: Wideband audio support, G.711, G.729 codecs.
Protocols: SIP, SCCP, HTTP, HTTPS, TFTP.
Power: PoE Class 3 or 48V DC power adapter.
Supported features: Call waiting, hold, transfer, conference, forward.
Operating Temp: 32°F to 104°F (0°C to 40°C).
Dimensions: 9.0" x 10.5" x 6.5" (229 x 267 x 165 mm).

Controls and Settings

Access settings via phone menu or web interface.

Front Panel: Line keys, Navigation cluster, Speakerphone, Mute, Headset, Volume.

Menu Options: Settings > Network Configuration, User Preferences, Phone Status.

Basic Settings: Ring tone selection, Display contrast, Time/Date format. Network: IP address, subnet mask, gateway, TFTP server. Audio: Speaker volume, microphone gain, codec preference. Security: Password protection, encrypted calls.

Connecting Devices

Network: Ethernet cable to switch. PC: Second Ethernet port. Headset: 3.5mm jack.

Turn off phone before connecting additional devices.
Match cables to correct ports (PC to PC port).
Verify connections show link lights on Ethernet ports.

Tip: Use Cat5e or better Ethernet cables for optimal performance.

Advanced Call Features

Supports enterprise calling features via Cisco Unified Communications Manager.

Make call: Lift handset or press Speakerphone, dial number.
Answer call: Press Answer softkey or lift handset.
Hold: Press Hold button during active call.
Transfer: Press Transfer, dial target number, press Transfer again.
Conference: Press Conference, dial participant, press Conference again.
Forward: Settings > Call Forward > Always/No Answer/Busy.
Speed dial: Program frequently called numbers to line keys.
Call history: Press Directories to view missed, received, placed calls.

WARNING! Emergency calls may require special configuration.

Accessibility Features

Visual alerts: Flashing LED for incoming calls. Audio adjustments: Separate volume controls for ringer, speaker, handset. Large font: Option for larger display text. TTY compatible: With appropriate adapter.

Care & Cleaning

Unplug before cleaning. Use slightly damp cloth; avoid liquids on electronics.

CAUTION! Do not use abrasive cleaners; keep away from extreme temperatures.

Regulatory Information

FCC Part 15: Class A digital device; complies with interference limits for business use. CE marked for European compliance. Copyright © 2025 Cisco Systems, Inc. All rights reserved. For support, visit www.cisco.com or contact Cisco Technical Assistance Center.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Phone not powering on	Power source/Ethernet	Check PoE switch or power adapter; verify Ethernet cable.
No dial tone	Network/registration	Check network connection; verify phone registered with CUCM.
Poor audio quality	Network/audio settings	Check network QoS; adjust audio settings in web interface.
Display issues	Settings/power	Adjust display contrast; reboot phone.
Cannot make calls	Configuration	Verify dial plan configuration; check for error messages.

Reset: Settings > Reset Settings > Restore Defaults.

Service: Cisco Technical Assistance Center: 1-800-553-2447; www.cisco.com