Installation Guide
Tools Needed:
- Ethernet cable (Cat5e or higher)
- Power adapter (included)
- Handset and cord
- Mounting bracket (optional)
- Network switch with PoE support
Step-by-Step Installation
- Choose Installation Location: Select a location near network connection with adequate ventilation and accessibility.
- Unpack Components: Remove all packaging materials including protective films from screen and handset.
- Connect Network Cable: Connect Ethernet cable to network port on phone and to PoE switch or router.
- Power Connection: If not using PoE, connect the power adapter to phone and power outlet.
- Connect Handset: Attach handset cord to handset port and handset base.
- Optional Accessories: Connect headset, additional line modules, or expansion modules if required.
- Initial Setup: Power on phone and follow on-screen prompts for network configuration and registration.
Specifications
| Model Series | CP-8841/8851/8861 |
| Type | IP Business Phone |
| Color | Black / Charcoal |
| Display | 5-inch color LCD (480 x 272 pixels) |
| Network Ports | 2 x 10/100/1000 Ethernet (1 with PoE) |
| Audio Codecs | G.711, G.722, G.729, iLBC, Opus |
| Protocol Support | SIP, SCCP, HTTP/HTTPS, TFTP |
| Power Requirements | 802.3af PoE or 48V DC adapter |
| Dimensions (HxWxD) | 22.5 x 24.5 x 18.5 cm |
| Weight | 1.8 kg |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Humidity Range | 10% to 90% non-condensing |
Warranty Information
- Standard Warranty: 1 year parts and labor
- Extended Warranty: Available up to 5 years
- Software Support: 90 days included, annual renewal available
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 crystal-clear voice quality for more natural conversations and reduced listening fatigue.
Gigabit Ethernet
Built-in Gigabit Ethernet switch allows PC connection through phone, eliminating need for additional network drops at each desk location.
Full-Duplex Speakerphone
Advanced acoustic design with echo cancellation enables natural, hands-free conversations without clipping or feedback.
Bluetooth Support
Integrated Bluetooth allows wireless connection to headsets and mobile devices for enhanced mobility and flexibility.
XML Integration
Custom XML applications can be deployed to display corporate directories, weather, stock information, or custom business applications.
Security Features
Comprehensive security including encrypted signaling (TLS), encrypted media (SRTP), and device authentication for secure communications.
Call Management Features
Call Forwarding
Forward calls based on busy, no answer, or all calls conditions to any internal or external number
Conference Calling
Create ad-hoc conferences with up to 8 participants including both internal and external parties
Call Recording
One-touch recording of conversations with automatic storage to network location or local media
Shared Lines
Multiple users can share line appearances for receptionist or team answering scenarios
Call Park/Retrieve
Park calls at extension numbers and retrieve from any phone in the system
Do Not Disturb
Temporarily silence ringer while allowing important calls through based on caller ID
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Phone won't power on | Power issue, faulty PoE switch, bad cable | Check power source, try different cable, test with power adapter |
| No dial tone | Network issue, registration failure, configuration error | Check network connectivity, verify registration status, review configuration |
| Poor audio quality | Network congestion, codec mismatch, faulty handset | Check network QoS settings, verify codec configuration, test with different handset |
| Display issues | Loose connection, software bug, hardware failure | Check display cable, reboot phone, update firmware |
| Cannot make external calls | Dial plan restriction, trunk configuration, service provider issue | Check dial plan, verify trunk configuration, contact service provider |
| Bluetooth not working | Bluetooth disabled, pairing issue, incompatible device | Enable Bluetooth, re-pair device, check device compatibility |
Common Status Messages
- Registering: Phone attempting to register with call manager - Check network and server connectivity
- Configuring IP: Phone obtaining network settings - Check DHCP server operation
- TFTP Error: Cannot download configuration - Verify TFTP server settings and file permissions
- DNS Error: Cannot resolve server name - Check DNS configuration and server availability
- No Service: Phone registered but no service - Check call manager configuration
- Security Error: Certificate or security issue - Verify security certificates and configuration
Manual Downloads
Current Model Manuals
CP-8841
3-line IP Phone with Gigabit
CP-8851
5-line IP Phone with Color Display
CP-8861
8-line IP Phone with Expansion
CP-8865
Conference Phone
Popular Previous Models
CP-7945G
4-line IP Phone
CP-7965G
6-line IP Phone
CP-7975G
Color IP Phone
CP-8945
5-line HD Voice Phone