CP-7811-K9 – Single-Line IP Phone – 10/100 Ethernet – PoE Class 1

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CP-7811-K9 Description

The CP-7811-K9 is a Cisco IP Phone 7811 single-line desk phone in the Cisco IP Phone 7800 Series for common-area and occasional-use positions on Cisco Unified Communications Manager. The phone has a 3.28 in. 384 x 106 pixel grayscale display, a 10/100BASE-T switch with two RJ-45 ports and IEEE 802.3af Class 1 PoE at no more than 3.84W. The phone needs a Basic User Connect License on Cisco Unified Communications Manager 12.5 or later, and its default handset is narrowband, with wideband audio only through an optional handset.

Quick Specs

Parameter

Specification

Product ID

CP-7811-K9

Product type

Cisco IP Phone 7811 desk phone

Supported line keys

0

Display

3.28 in. 384 x 106 pixel grayscale display

Ethernet switch

10/100BASE-T with LAN and downstream-device RJ-45 ports

PoE class

IEEE 802.3af Class 1

Power input rating

0.42A, 48V DC

CUCM license

Basic User Connect License

CUCM support

Cisco Unified Communications Manager 12.5 and above

Default handset

Narrowband handset, with wideband available through optional handset

Dimensions and weight

207 x 195 x 33 mm, 806 g

Application Scenarios

Lobby And Cafeteria Positions

In a lobby, cafeteria or conference-center corridor, the phone gives visitors and staff a single-line extension on Cisco Unified Communications Manager without programmable line keys to manage.

Wall-Mounted Corridor Phone

In a hallway or work area with little desk space, the phone mounts on the wall with the optional wall-mount kit and still passes a 10/100BASE-T connection to a downstream device.

Low-Power PoE Floors

On a floor with many phone drops, each phone draws no more than 3.84W as an IEEE 802.3af Class 1 device, which keeps the switch’s PoE budget available for other endpoints.

Product Comparison

Parameter

CP-7811-K9

CP-7821-K9

CP-7841-K9

Supported line keys

0

2

4

Display

3.28 in. 384 x 106 pixels, grayscale

3.5 in. 396 x 162 pixels, backlit grayscale

3.5 in. 396 x 162 pixels

Color availability

Charcoal

Charcoal and white

Charcoal and white

Default handset

Narrowband

Wideband

Wideband

Ethernet switch

10/100BASE-T

10/100BASE-T

10/100/1000BASE-T

User connect license

Basic

Basic

Enhanced

PoE class

IEEE 802.3af Class 1

IEEE 802.3af Class 1

IEEE 802.3af Class 1

CP-7811-K9 is the entry model of the 7800 Series, listed with 0 line keys in the table against 2 on CP-7821-K9, and it ships with a narrowband handset and a 3.28 in. 384 x 106 display, while CP-7821-K9 adds a 396 x 162 backlit grayscale display, a wideband handset by default and a white color option. Both need only a Basic User Connect License and run on 10/100BASE-T. Desks that need four lines or Gigabit Ethernet move to CP-7841-K9, the only 7800 model with 10/100/1000BASE-T, which also needs an Enhanced User Connect License. For sixteen lines, order CP-7861-K9 at the same Enhanced license level.

Ordering Checklist

  • User Connect License: Order one Basic UCL per phone on Cisco Unified Communications Manager 12.5 or later. An Enhanced UCL is unnecessary for this model, and no UCL leaves the phone unlicensed.
  • Non-PoE power: Add Cisco Power Adapter 3 in the regional PID, for example CP-PWR-ADPT-3-NA= or CP-PWR-ADPT-3S-UK=, with the matching regional cord. The phone is 802.3af Class 1 PoE; without PoE it has no power source.
  • Wideband handset: Add CP-DX-HS= if wideband audio is needed. The phone ships with a narrowband default handset on CP-7811-K9.
  • Mounting: Add CP-7811-WMK= wall mount or CP-7811-FS= footstand if required. Both are separate 7811-specific PIDs.

Product Front

The Cisco IP Phone 7800 Series has distinct hardware types:

  • Cisco IP Phone 7811 No buttons on either side of the screen
  • Cisco IP Phone 7821 Two buttons on the left side of the screen
  • Cisco IP Phone 7841 Two buttons on either side of the screen
  • Cisco IP Phone 7861 16 buttons at the right edge of the phone

1

Incoming call or voicemail indicator

2

Line and feature buttons

3

Softkeys

4

Navigation (navigation ring and Select button

5

Hold, Transfer, and Conference

6

Speakerphone, Headset, and Mute

7

Voicemail, Applications, and Directory

8

Volume

Use line and feature buttons to view calls on a line, or access features such as Speed Dial.Buttons illuminate to indicate status:

Green, steady

 Active call

Green, flashing

 Held call

Amber, steady

 Private line in use

Amber, flashing

 Incoming call

Red, steady

 Remote line in use

Red, flashing

 Remote line on hold

Specifications

Parameter Specification Parameter Specification
Product ID CP-7811-K9 Cisco ordering ID CP-7811-K9=
Product type Cisco IP Phone 7811 desk phone Supported line keys 0
Display 3.28 in. 384 x 106 pixel grayscale display Ethernet switch 10/100BASE-T with two RJ-45 ports
PoE class IEEE 802.3af Class 1 Maximum power consumption Does not exceed 3.84 W
Power input rating 0.42A, 48V DC CUCM license Basic User Connect License
CUCM support Cisco Unified Communications Manager 12.5 and above Hosted collaboration support Cisco Hosted Collaboration Solution 8.6.2 and later
SRST support Cisco Unified SRST 8.x and later Signaling protocol Session Initiation Protocol
Codec support G.711, G.722, G.722.2, G.729ab, iLBC, OPUS Default handset Narrowband handset with RJ-9 connection
Wideband handset Available with optional wideband handset Foot-stand position 45 degrees
Wall mounting Optional wall-mount kit Dimensions 207 x 195 x 33 mm excluding foot stand
Weight 806 g Operating temperature 0°C to 40°C (32°F to 104°F)
Operating humidity 10% to 90%, non-condensing Phone casing composition Polycarbonate ABS textured plastic

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    Janice Silva
    Posted on 28/04/2026
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    5.0

    Requested a copy of the packing list for our records. Received it promptly.

    Karen Ortiz
    Posted on 16/01/2026
    Verified Buyer
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    Our annual vendor review consistently rates Layer23 among the best.

    Marcus Zhang
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    Our replacement cycle means we order quarterly. Layer23 handles it like clockwork.

    Telecom Team
    Posted on 01/11/2024
    Verified Buyer
    4.0

    Ordered 50 for dorms. Bulk packing was convenient.

    Rick Grimes
    Posted on 15/06/2024
    Verified Buyer
    5.0

    We need clear lines of communication. This phone delivers.

Questions & Answers

  • At what angle does CP-7811-K9 sit on its foot stand?

    It has a single foot stand position at 45 degrees. Plan desk placement around that fixed angle, since the datasheet lists no other position. If a stand is lost or damaged, order the spare CP-7811-FS=. Wall mounting uses the separate CP-7811-WMK=.
  • Which spare handset parts can be ordered for CP-7811-K9?

    Cisco lists CP-DX-HS-NB= as the narrowband handset spare for this phone and CP-DX-HS= as the wideband spare for the 7800 Series. The handset cord is CP-7800-HS-CORD=, and the handset hook is CP-7800-HS-HOOK=, sold in packs of 20. Order the narrowband spare to keep the default handset.
  • Does the Cisco notice on MIC and LSC certificates list CP-7811-K9?

    Yes. CP-7811-K9 is on the affected PID list of a Cisco notice about MIC and LSC certificates, which also names CP-7832-K9=, CP-9951-C-K9 and CP-6921. The notice concerns certificates and does not change the ordering PID. Read the notice itself for the problem description and the workaround before deploying.
  • Is CP-7811-K9 available in white?

    No. The 7800 Series ordering table lists CP-7811-K9= with no white PID. White versions exist only for other models, as CP-7821-W-K9=, CP-7841-W-K9= and CP-7861-W-K9=. A position that needs a white phone therefore cannot be filled with this model, and the order should be planned in charcoal.

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  • CP-7811-K9 Datasheet