1. Introducció
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. Configuració
2.1 Contingut del paquet
- Cisco IP Phone 8851 Unit
- Telèfon
- Cable de l'auricular
- Cable Ethernet
- Bisell negre
2.2 Connexió del telèfon
- Connecteu el telèfon: Connecteu un extrem del cable del auricular al auricular i l'altre extrem al port de l'auricular de la base del telèfon.
- 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.
- Connexió a l'ordinador (opcional): 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.
- Engegada inicial: 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.
Nota: This device is optimized for Cisco Webex Calling. A Cisco Webex subscription must be purchased separately for full functionality with Webex services.

Un professional secundarifile 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. Com utilitzar el telèfon
3.1 Característiques i funcions principals
- 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 Fer i rebre trucades
- Per fer una trucada: Lift the handset, press a line button, or press the Speaker button. Dial the number using the keypad.
- Per respondre una trucada: Lift the handset, press the flashing line button, or press the Speaker button.
- Per finalitzar una trucada: Replace the handset, or press the End Call soft key on the display.
3.3 Call Management Features
- Hold/Resume: Premeu el botó Aguanta button to place an active call on hold. Press the Currículum soft key or the flashing line button to retrieve the call.
- Transferència: Durant una trucada activa, premeu Transferència button. Dial the number to which you want to transfer the call. Wait for the recipient to answer (consultative transfer) or press Transferència again immediately (blind transfer).
- Conferència: Durant una trucada activa, premeu Conferència button. Dial the number of the person you want to add to the conference. Once they answer, press Conferència de nou per unir-se a tots els partits.
- Correu de veu: Premeu el botó Missatges per accedir al correu de veu. Segueix les indicacions d'àudio.
4. Manteniment
4.1 Neteja del telèfon
To maintain the appearance and functionality of your Cisco IP Phone 8851, follow these cleaning guidelines:
- Always disconnect the phone from power before cleaning.
- Utilitzeu un drap suau i sense pelusa lleugerament dampnetejat amb aigua o un netejador suau i no abrasiu.
- 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. Solució De Problemes
5.1 Problemes comuns i solucions
- 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. - Problemes de visualització:
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 Notes de compatibilitat
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. Especificacions
Below are the key technical specifications for the Cisco IP Phone 8851 (Model: CP-8851-3PW-NA-K9=):
| Característica | Especificació |
|---|---|
| Marca | Cisco |
| Número de model | 8851 (CP-8851-3PW-NA-K9=) |
| Mostra | 5-inch VGA Backlit Color Display |
| Línies | 10 |
| Tecles suaus | 4 |
| Port USB | USB-A |
| Alimentació per Ethernet (PoE) | Class 2 PoE |
| Interruptor Ethernet | Gigabit Ethernet Switch (for PC connection) |
| Bluetooth | Sí |
| Indicacions de veu | Sí |
| Integració de telèfon intel·ligent | Sí |
| Muntatge a la paret | Sí |
| Color | Negre |
| Pes de l'article | 2.62 lliures |
| Dimensions del producte (L x A x A) | 1.6 x 10.1 x 9 polzades |
| Fabricant | CISCO |

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. Garantia i Suport
7.1 Garantia del producte
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 weblloc web. Conserveu el comprovant de compra per a reclamacions de garantia.
7.2 Suport tècnic
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 weblloc:
When contacting support, please have your product model (8851) and serial number ready.





