Cisco IP Phone 8851, CP-8851-K9 — New, Bluetooth Enterprise IP Phone
Warranty: Lifetime
The Cisco IP Phone 8851 CP-8851-K9 is a brand-new, standard enterprise desk phone built for Cisco Unified Communications Manager (Unified CM / Call Manager) environments. It features a 5-inch color display, five programmable line keys, Bluetooth for wireless headsets, and dual Gigabit Ethernet ports with PoE, so no external power is needed. It ships with Cisco's Unified CM (Enterprise) firmware and registers directly to a Cisco Unified Communications Manager cluster over SIP.
Key Features
- 5" backlit color LCD (800 x 480) widescreen VGA display
- 5 programmable line keys for Cisco Unified Communications Manager registration, expandable up to 66 lines with two Key Expansion Modules
- Bluetooth 3.0 EDR Class 1 for wireless headset pairing (up to 66 ft range)
- Side-mounted USB port for wired/wireless headsets and device charging (up to 500 mA)
- Dual Gigabit Ethernet ports (network + PC passthrough) with PoE, no external power needed
- Full-duplex speakerphone with wideband audio
- Hearing Aid Compatible (HAC) handset, ADA and Section 508 compliant
- Broad audio codec support: G.711, G.722, G.722.2, G.729ab, iLBC, Opus
Technical Specifications
- Model: Cisco CP-8851-K9 (IP Phone 8851, Unified CM / Enterprise Firmware)
- Condition: New
- Color: Charcoal
- Display: 5" color LCD, 800 x 480
- Connectivity: 2x Gigabit Ethernet (RJ45), Bluetooth 3.0 EDR Class 1; no Wi-Fi
- USB: 1x USB port (headset / charging)
- Power: PoE IEEE 802.3af/at; optional AC adapter (sold separately)
- Call control platform: Cisco Unified Communications Manager (Unified CM / Call Manager) only
- Signaling protocol: SIP (registers to Cisco Unified CM)
- Lines: 5 programmable line keys, expandable to up to 66 lines with two Key Expansion Modules
- Ports: 1x RJ9 handset, 1x RJ9 headset, 1x USB
- Dimensions/Weight: 9.02 x 10.13 x 1.57 in.; 2.62 lb with handset
What's in the Box
Desk phone, handset, handset cable, dual-position stand, Ethernet cable, and quick-start guide. AC power adapter not included.
Frequently Asked Questions
Is the Cisco CP-8851-K9 compatible with Webex Calling, BroadWorks, or Asterisk?
No. This unit ships with Cisco's Unified CM (Enterprise) firmware, which registers only to Cisco Unified Communications Manager (Call Manager). Webex Calling, BroadWorks, and third-party SIP platforms require the separate multiplatform (3PCC) firmware variant.
Does the Cisco 8851 support Wi-Fi and Bluetooth?
It supports Bluetooth 3.0 EDR Class 1 for pairing wireless headsets, but it does not support Wi-Fi — it connects to the network over wired dual Gigabit Ethernet.
What's the difference between the 8851 and the 8841?
The 8851 adds Bluetooth for wireless headsets and a side-mounted USB port for headset connectivity and charging, plus support for up to two Key Expansion Modules (66 lines total) versus the 8841's baseline 5 lines with no Bluetooth or USB.
Does the Cisco 8851 phone require a separate power adapter?
No. It supports Power over Ethernet (802.3af/at), so it can be powered directly through a PoE switch. An AC adapter is available separately if PoE isn't an option.
Is this unit new or refurbished?
This Cisco CP-8851-K9 is brand new, factory-sealed stock.
The Cisco IP Phone 8851 CP-8851-K9 is a brand-new, standard enterprise desk phone built for Cisco Unified Communications Manager (Unified CM / Call Manager) environments. It features a 5-inch color display, five programmable line keys, Bluetooth for wireless headsets, and dual Gigabit Ethernet ports with PoE, so no external power is needed. It ships with Cisco's Unified CM (Enterprise) firmware and registers directly to a Cisco Unified Communications Manager cluster over SIP.
Key Features
- 5" backlit color LCD (800 x 480) widescreen VGA display
- 5 programmable line keys for Cisco Unified Communications Manager registration, expandable up to 66 lines with two Key Expansion Modules
- Bluetooth 3.0 EDR Class 1 for wireless headset pairing (up to 66 ft range)
- Side-mounted USB port for wired/wireless headsets and device charging (up to 500 mA)
- Dual Gigabit Ethernet ports (network + PC passthrough) with PoE, no external power needed
- Full-duplex speakerphone with wideband audio
- Hearing Aid Compatible (HAC) handset, ADA and Section 508 compliant
- Broad audio codec support: G.711, G.722, G.722.2, G.729ab, iLBC, Opus
Technical Specifications
- Model: Cisco CP-8851-K9 (IP Phone 8851, Unified CM / Enterprise Firmware)
- Condition: New
- Color: Charcoal
- Display: 5" color LCD, 800 x 480
- Connectivity: 2x Gigabit Ethernet (RJ45), Bluetooth 3.0 EDR Class 1; no Wi-Fi
- USB: 1x USB port (headset / charging)
- Power: PoE IEEE 802.3af/at; optional AC adapter (sold separately)
- Call control platform: Cisco Unified Communications Manager (Unified CM / Call Manager) only
- Signaling protocol: SIP (registers to Cisco Unified CM)
- Lines: 5 programmable line keys, expandable to up to 66 lines with two Key Expansion Modules
- Ports: 1x RJ9 handset, 1x RJ9 headset, 1x USB
- Dimensions/Weight: 9.02 x 10.13 x 1.57 in.; 2.62 lb with handset
What's in the Box
Desk phone, handset, handset cable, dual-position stand, Ethernet cable, and quick-start guide. AC power adapter not included.
Frequently Asked Questions
Is the Cisco CP-8851-K9 compatible with Webex Calling, BroadWorks, or Asterisk?
No. This unit ships with Cisco's Unified CM (Enterprise) firmware, which registers only to Cisco Unified Communications Manager (Call Manager). Webex Calling, BroadWorks, and third-party SIP platforms require the separate multiplatform (3PCC) firmware variant.
Does the Cisco 8851 support Wi-Fi and Bluetooth?
It supports Bluetooth 3.0 EDR Class 1 for pairing wireless headsets, but it does not support Wi-Fi — it connects to the network over wired dual Gigabit Ethernet.
What's the difference between the 8851 and the 8841?
The 8851 adds Bluetooth for wireless headsets and a side-mounted USB port for headset connectivity and charging, plus support for up to two Key Expansion Modules (66 lines total) versus the 8841's baseline 5 lines with no Bluetooth or USB.
Does the Cisco 8851 phone require a separate power adapter?
No. It supports Power over Ethernet (802.3af/at), so it can be powered directly through a PoE switch. An AC adapter is available separately if PoE isn't an option.
Is this unit new or refurbished?
This Cisco CP-8851-K9 is brand new, factory-sealed stock.