Cisco IP Phone 8851 User Manual

1. Introduction

This manual provides essential information for setting up, operating, and maintaining your Cisco IP Phone 8851. The Cisco IP Phone 8851 is designed to enhance personal productivity in the workplace through its powerful yet user-friendly features. It boasts an attractive, ergonomic design for comfortable use, wideband audio for crystal-clear voice communications, and encrypted voice communications for enhanced security.

This image displays the Cisco IP Phone 8851 from the front, highlighting its ergonomic handset, the main unit with its vibrant 5-inch VGA backlit color display, and the clearly labeled keypad for dialing and feature access.

2. Setup

2.1 Package Contents

• Cisco IP Phone 8851 Unit
• Handset
• Handset Cord
• Ethernet Cable
• Black Bezel

2.2 Connecting the Phone

1. Connect the Handset: Plug one end of the handset cord into the handset and the other end into the handset port on the phone base.
2. Connect to Network and Power: The Cisco IP Phone 8851 supports Power over Ethernet (PoE). Connect an Ethernet cable from your network switch (which must provide PoE) to the network port on the back of the phone. This single connection provides both network access and power. If PoE is not available, an optional power adapter (sold separately) can be used.
3. Connect to PC (Optional): If you wish to connect a computer through the phone, use another Ethernet cable to connect your PC to the PC port on the back of the phone. The phone features a built-in Gigabit Ethernet switch.
4. Initial Boot-up: Once connected, the phone will power on and begin its boot-up sequence. This may take a few minutes as it obtains network settings and firmware.

Note: This device is optimized for Cisco Webex Calling. A Cisco Webex subscription must be purchased separately for full functionality with Webex services.

A side profile of the Cisco IP Phone 8851, showcasing its sleek design and the optimal viewing angle of its color display, designed for comfortable use on a desk.

3. Operating Your Phone

3.1 Key Features and Functions

• Fixed Function Keys: The phone provides one-touch access to essential features such as service, messaging, directory, hold/resume, transfer, and conference. These keys are clearly labeled on the phone's interface.
• Programmable Line Keys: The line keys on the side of the display are fully programmable. They can be configured to support multiple lines (directory numbers) or various call features like speed dialing, busy lamp field (BLF), or call pickup. Your system administrator typically configures these.
• 5-inch VGA Backlit Color Display: The large, high-resolution display provides clear visibility for call information, directories, and feature menus. Navigate through menus using the navigation cluster and select options with the soft keys located directly below the display.
• Wideband Audio: Experience superior voice clarity during calls thanks to the phone's wideband audio capabilities.

3.2 Making and Receiving Calls

1. To Make a Call: Lift the handset, press a line button, or press the Speaker button. Dial the number using the keypad.
2. To Answer a Call: Lift the handset, press the flashing line button, or press the Speaker button.
3. To End a Call: Replace the handset, or press the End Call soft key on the display.

3.3 Call Management Features

• Hold/Resume: Press the Hold button to place an active call on hold. Press the Resume soft key or the flashing line button to retrieve the call.
• Transfer: During an active call, press the Transfer button. Dial the number to which you want to transfer the call. Wait for the recipient to answer (consultative transfer) or press Transfer again immediately (blind transfer).
• Conference: During an active call, press the Conference button. Dial the number of the person you want to add to the conference. Once they answer, press Conference again to join all parties.
• Voicemail: Press the Messages button to access your voicemail. Follow the audio prompts.

4. Maintenance

4.1 Cleaning Your Phone

To maintain the appearance and functionality of your Cisco IP Phone 8851, follow these cleaning guidelines:

• Always disconnect the phone from power before cleaning.
• Use a soft, lint-free cloth slightly dampened with water or a mild, non-abrasive cleaner.
• Avoid spraying liquids directly onto the phone or into any openings.
• Do not use harsh chemicals, abrasive cleaners, or solvents, as these can damage the phone's finish and components.
• Gently wipe the display, keypad, and handset.

5. Troubleshooting

5.1 Common Issues and Solutions

• Phone Does Not Power On:
  Ensure the Ethernet cable is securely connected to the network port and that your network switch provides Power over Ethernet (PoE). If using an optional power adapter, ensure it is properly connected to a working power outlet.
• No Dial Tone or Cannot Make/Receive Calls:
  Verify network connectivity. Check the Ethernet cable connection. Contact your system administrator to ensure your phone line is provisioned correctly and there are no network issues.
• Poor Call Quality (Echo, Static):
  Check your network connection. Ensure the handset cord is securely connected. If using a headset, ensure it is properly connected and functioning.
• Display Issues:
  If the display is blank or frozen, try restarting the phone by disconnecting and reconnecting the power/Ethernet cable. If the issue persists, contact support.

5.2 Compatibility Notes

The Cisco IP Phone 8851 integrates with various industry-leading call control platforms. However, specific integrations may require additional licenses or services from your service provider or system administrator.

6. Specifications

Below are the key technical specifications for the Cisco IP Phone 8851 (Model: CP-8851-3PW-NA-K9=):

This table provides a detailed comparison of various Cisco IP Phone 8800 series models. For the 8851 model, it confirms features such as a color display, 10 lines, 4 soft keys, a USB-A port, Power over Ethernet (PoE), Bluetooth, voice prompts, and smart phone integration. It also indicates that the 8851 does not include WiFi, DECT, or HD 720p video capabilities.

7. Warranty and Support

7.1 Product Warranty

Cisco products typically come with a standard manufacturer's warranty. For specific details regarding the warranty period and coverage for your Cisco IP Phone 8851, please refer to the warranty documentation included with your purchase or visit the official Cisco website. Keep your proof of purchase for warranty claims.

7.2 Technical Support

For technical assistance, troubleshooting beyond this manual, or inquiries about your Cisco IP Phone 8851, please contact Cisco Technical Support. You can find support resources, documentation, and contact information on the official Cisco website:

Visit Cisco Support

When contacting support, please have your product model (8851) and serial number ready.