Cisco IP Phone 8811 Greyscale Business Desk Phone, Gigabit
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PRODUCT DESCRIPTION
Cisco IP Phone 8811 Series (CP-8811-K9=) — Local Warranty
Gigabit desk phone for everyday calling
The Cisco IP Phone 8811 (CP-8811-K9=) is a business desk phone for general office users, registering to Cisco call control: Cisco Unified Communications Manager 12.5 and later, Unified CME 10.0 and later, Business Edition 6000 or Cisco Hosted Collaboration Solution.
5-inch high-resolution greyscale display
A 5-inch 800 x 480 widescreen backlit greyscale display gives clear caller, directory and call-state information.
Five line keys
Five programmable keys can be assigned to directory numbers or calling features, with fixed keys for hold, transfer, conference, messaging and directory.
Wideband audio and speakerphone
Wideband audio on the handset and full-duplex speakerphone, with noise reduction and echo cancellation. An RJ-9 analogue headset jack and an AUX port for electronic hookswitch control support wired third-party headsets.
Gigabit pass-through and low power
An internal 2-port 10/100/1000 switch lets the phone and a desktop PC share one cable drop. The phone is IEEE PoE Class 2, supports Cisco EnergyWise and is Energy Star qualified.
Cisco IP Phone 8811 Datasheet — Technical Specifications
Display & Keys
| Display | 5-in. 800 x 480 widescreen backlit greyscale |
| Line keys | 5 programmable line/feature keys |
Audio
| Speakerphone | Full-duplex, wideband |
| Handset | Wideband RJ-9 |
| Headset | RJ-9 analogue headset jack, AUX port (electronic hookswitch) |
| Codecs | G.711 (A-law/µ-law), G.722, G.722.2, G.729ab, iLBC, iSAC, OPUS |
| Processing | Noise reduction, echo cancellation |
Connectivity
| Ethernet | Internal 2-port 10/100/1000BASE-T switch (LAN + PC) |
| Bluetooth / USB | Not listed for the 8811 in the Cisco datasheet |
Power
| PoE | IEEE PoE Class 2 |
| Energy | Cisco EnergyWise; Energy Star qualified |
Security
| Features | Secure boot, device authentication, TLS signalling and SRTP media encryption |
| Network access | 802.1X (EAP-FAST, EAP-TLS) |
Physical
| Dimensions | 229.1 x 257.34 x 40 mm |
| Weight | 1.17 kg (2.58 lb) |
| Operating temperature | 0° to 40°C |
| Wall-mount kit | CP-8800-WMK=, sold separately |
Compatibility & Software Support
Call control (this part number)
CP-8811-K9= ships with enterprise firmware for Cisco Unified Communications Manager 12.5 and later, Cisco Unified CME 10.0 and later, Cisco Business Edition 6000 and Cisco Hosted Collaboration Solution.
Webex Calling and third-party SIP
For Cisco Webex Calling, BroadWorks or certified third-party SIP platforms, Cisco sells the multiplatform-firmware version CP-8811-3PCC-K9=.
Lifecycle status
Cisco has not published an end-of-sale notice for the IP Phone 8811 as of October 2026; the 8800 Series support page lists it as an available model.
Warranty
Local Singapore unit with local warranty. Cisco's datasheet lists a 1-year replacement warranty for this phone. For warranty claims, keep your SourceIT invoice as proof of purchase.
Package Contents & Cisco IP Phone Ordering Information
What the Part Number Covers
CP-8811-K9= is the phone with enterprise firmware. Local power supply and the wall-mount kit (CP-8800-WMK=) are separate accessories; the Cisco datasheet does not publish a full in-the-box list.
Cisco IP Phone Family
| Model | Key difference |
| Cisco IP Phone 7811 (CP-7811-K9=) | 1 line, 3.28-in. greyscale non-backlit display, 10/100 switch, no headset port |
| Cisco IP Phone 8811 (CP-8811-K9=) (this listing) | 5 line keys, 5-in. backlit greyscale display, Gigabit switch, headset + AUX ports |
| Cisco IP Phone 8851 (CP-8851-K9=) | 5 line keys, 5-in. colour display, Bluetooth, USB, Intelligent Proximity, KEM support |
| CP-8811-3PCC-K9= | 8811 with multiplatform firmware for Webex Calling / third-party SIP |
Datasheet & Downloads
Frequently Asked Questions — Cisco IP Phone 8811
What is the difference between the 8811 and 8851?
Both have five line keys, a 5-inch display and a Gigabit switch. The 8851 adds a colour display, Bluetooth, a USB port, Intelligent Proximity for mobiles and Key Expansion Module support; the 8811 has a greyscale display and draws less power (PoE Class 2).
Does the 8811 support Bluetooth headsets?
Bluetooth is not listed for the 8811 in Cisco's datasheet. Use the RJ-9 headset jack, with the AUX port for electronic hookswitch control.
Will it work with Webex Calling?
CP-8811-K9= has enterprise firmware for Cisco Unified CM and related platforms. For Webex Calling, Cisco offers CP-8811-3PCC-K9= with multiplatform firmware.
Can a PC connect through the phone?
Yes. The internal 2-port 10/100/1000 switch passes a PC connection through at Gigabit speed.
