Installation Guide
Tools Needed:
- Ethernet cable (Cat5e or higher)
- Power adapter (if not using PoE)
- Network switch with PoE support
- Screwdriver (for wall mount)
- Network configuration tool
Step-by-Step Installation
- Choose Installation Location: Select a location near network connection with proper ventilation and accessibility.
- Unpack and Inspect: Remove all packaging materials and check for any visible damage to the phone.
- Network Connection: Connect the Ethernet cable from the network port to your PoE switch or router.
- Power Connection: If not using PoE, connect the power adapter to the phone and power outlet.
- Handset and Cables: Connect the handset cord to the handset port and ensure all cables are securely connected.
- Power On: Press the power button and wait for the phone to boot up and register with the network.
- Configuration: Follow the on-screen prompts to configure network settings and user preferences.
Specifications
| Model Series | CP-8841 / CP-8851 / CP-8861 |
| Type | IP Business Phone |
| Color | Black / White |
| Display | 5-inch color LCD (480 x 272 pixels) |
| Network Protocol | SIP 2.0 (RFC 3261) |
| Audio Codecs | G.711, G.729, G.722, iLBC, Opus |
| Power Requirements | PoE (802.3af) or 48V DC adapter |
| Network Ports | 2 x 10/100/1000 Ethernet (PC pass-through) |
| Dimensions (HxWxD) | 22.5 x 24.5 x 17.5 cm |
| Weight | 1.8 kg |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Supported Languages | English, Spanish, French, German, Chinese |
Warranty Information
- Full Warranty: 1 year parts and labor
- Extended Support: Available through Cisco Smart Net Total Care
- Software Updates: 3 years of firmware updates included
For warranty service, contact Cisco Technical Support at 1-800-553-2447 or visit Cisco.com
Key Features
High-Definition Voice
Wideband audio support with G.722 codec provides superior voice quality and clarity for more natural conversations.
PoE Support
Power over Ethernet capability eliminates the need for separate power adapters, simplifying installation and reducing cable clutter.
Gigabit Ethernet
Dual Gigabit Ethernet ports with PC pass-through allow direct computer connection without requiring an additional network drop.
Backlit Display
High-resolution color display with adjustable backlight provides excellent visibility in various lighting conditions.
Integrated Security
Built-in security features including secure boot, encrypted configuration files, and TLS/SRTP support for call encryption.
Unified Communications
Full integration with Cisco Unified Communications Manager for advanced business communication features.
Call Management Features
Call Forwarding
Forward calls to another number or voicemail based on various conditions
Conference Calling
Host multi-party conference calls with up to 8 participants
Call Transfer
Transfer calls to other extensions or external numbers
Shared Lines
Multiple users can share phone lines for improved collaboration
Speed Dial
Programmable speed dial buttons for quick access to frequently called numbers
Call History
Track missed, received, and placed calls with timestamps
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Phone won't power on | Power issue, faulty PoE switch, defective adapter | Check power source, test with different PoE port, try AC adapter |
| No network connectivity | Network cable issue, switch configuration, IP conflict | Check cable connections, verify switch settings, check IP configuration |
| No dial tone | Registration failure, SIP configuration, network issues | Check registration status, verify SIP settings, test network connectivity |
| Poor audio quality | Network congestion, codec mismatch, hardware issue | Check network QoS settings, verify codec configuration, test with headset |
| Display issues | Backlight settings, cable connection, firmware issue | Adjust display settings, check internal connections, update firmware |
| Button not responding | Software freeze, hardware failure, configuration issue | Restart phone, check for physical damage, reset to factory defaults |
Status Messages and Error Codes
- Registering: Phone is attempting to register with call manager
- Registration Failed: Check network connectivity and SIP credentials
- No Service: Phone is not configured or cannot reach TFTP server
- DHCP Timeout: Phone cannot obtain IP address from DHCP server
- TFTP Error: Cannot download configuration from TFTP server
- DNS Error: Cannot resolve server hostnames
Manual Downloads
Current Model Manuals
CP-8841
Basic IP Phone with 2 lines
CP-8851
Standard IP Phone with 4 lines
CP-8861
Conference IP Phone
CP-8865
Full HD Video Phone
Popular Previous Models
CP-7945G
Classic IP Phone
CP-7965G
6-line IP Phone
CP-7975G
Color Display IP Phone
CP-8945
Wideband Audio Phone