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CP-8851-K9 – VoIP phone
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CP-8851-K9 Description
The Cisco IP Phone 8851 (CP-8851-K9) is a feature-rich, professional-grade VoIP desk phone from the Cisco 8800 Series, designed for executives, managers, and knowledge workers who demand advanced functionality and superior audio quality.Equipped with a 5-inch high-resolution widescreen color display, the 8851 provides an intuitive interface for call handling, directories, and applications. Its five programmable line keys support multiple lines, shared extensions, and feature access, while optional Key Expansion Modules (KEMs) increase capacity for receptionists or power users.With integrated Bluetooth 3.0, the CP-8851-K9 enhances mobility by enabling wireless headset pairing and mobile phone integration, allowing seamless call transfer between desk phone and smartphone. Dual Gigabit Ethernet ports ensure high-speed connectivity, while USB 2.0 adds flexibility for charging devices or connecting headsets.The 8851 supports wideband audio, full-duplex speakerphone, and advanced echo cancellation, delivering crystal-clear communication. It is fully compatible with Cisco Unified Communications Manager (12.5 and later), Cisco Business Edition 6000, and Hosted Collaboration Solution (HCS).
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Display |
5-inch widescreen WVGA color (800 × 480 pixels) |
|
Programmable Line Keys |
5 (expandable with up to 2 Key Expansion Modules, 56 additional keys) |
|
Ethernet Ports |
2× 10/100/1000BASE-T (LAN & PC passthrough) |
|
USB Port |
1× USB 2.0 (headset, smartphone charging, 500mA) |
|
Bluetooth |
Integrated Bluetooth 3.0 (headset pairing, mobile phone integration) |
|
Expansion Module Support |
Yes (2 × Cisco 8800 KEM) |
|
Audio |
Wideband audio, full-duplex speakerphone, RJ-9 headset, AUX EHS |
|
PoE Class |
IEEE 802.3af/at (Class 3 or Class 4 depending on HW revision) |
|
Power Supply (Optional) |
Cisco Power Cube 4 (48V DC, 0.917A) |
|
Call Control Platforms |
Cisco UCM 12.5+, CME 10.0+, BE6000, HCS |
Product Front
The following table describes the Cisco IP Phone 8800 Series Buttons.
The Cisco IP Phone 8800 Series has two distinct hardware types:
- Cisco IP Phones 8811, 8841, 8851, 8851NR, and 8861—do not have a camera.
- Cisco IP Phones 8845, 8865, and 8865NR—have a built-in camera.
|
1 |
Incoming call or voicemail indicator |
|
2 |
Camera (Cisco IP Phone 8845 and 8865) |
|
3 |
Feature and session buttons |
|
4 |
Softkeys |
|
5 |
Back, Navigation cluster, and Release |
|
6 |
Hold, Transfer, and Conference |
|
7 |
Headset, Speakerphone, and Mute |
|
8 |
Voicemail, Applications, and Directory |
|
9 |
Volume |
Model Selection Guide – Cisco CP-8851-K9
Specifications
| Parameter | Specification |
|---|---|
| Model | Cisco IP Phone 8851 (CP-8851-K9) |
| Display | 5-inch widescreen VGA, 800 × 480 pixels, 24-bit color |
| Programmable Line Keys | 5; multi-call per line supported |
| Expansion Module | Up to 2 × Cisco IP Phone 8800 KEM (56 extra keys) |
| USB Port | 1 × USB 2.0 Type A, 500mA @ 5V, supports headsets & smartphone charging |
| Ethernet Ports | 2 × 10/100/1000BASE-T (LAN + PC), VLAN support, Cisco Discovery Protocol, LLDP |
| Bluetooth | Integrated Bluetooth 3.0 for headset pairing & mobile phone integration |
| Headset Support | RJ-9, AUX (EHS), USB headsets supported |
| Speakerphone | Full-duplex, wideband audio, echo cancellation |
| Audio Codecs | G.711, G.722, G.722.2, G.729ab, iLBC, iSAC, Opus |
| PoE Support | IEEE 802.3af/at, Class 3 (pre-V08 HW), Class 4 (V08+ HW) |
| Optional Power | Cisco Power Cube 4, 48V DC, 0.917A |
| Call Control | CUCM 12.5+, CME 10.0+, BE6000, HCS |
| Security | Encrypted voice, Kensington lock slot |
| Dimensions | Weight: ~2.6 lb (1.18 kg), adjustable stand 35° & 50° |
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Quality Certifications
Customer Reviews
Questions & Answers
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What core capabilities make the Cisco CP-8851-K9 a dependable desk phone for most employees?
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How does CP-8851-K9 integrate with Webex Calling and CUCM?
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What PoE class should I plan for CP-8851-K9 with USB headsets?
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Does CP-8851-K9 support Bluetooth multipoint?
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Can I use CP-8851-K9 for hoteling desks?
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How does CP-8851-K9 compare to CP-8841-K9?
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Is CP-8851-K9 easy to wall-mount?
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What security measures are available?
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Does it support sidecars?
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What troubleshooting steps help with intermittent audio issues?
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Deployed 20 of these. KEM support is great for reception.
Solid phone. Buttons feel good. Shipping was fast.
Color screen, Bluetooth for headsets. Staff loves them. Fast shipping.
Mission accomplished. Phones arrived. They work.