CP-7811-K9 – Cisco IP Phone – VoIP Phone

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CP-7811-K9 Description

The Cisco IP Phone 7811 (CP-7811-K9) is an affordable, entry-level VoIP endpoint designed for secure, high-quality voice communications in small to large business environments. As part of the Cisco 7800 Series, the 7811 delivers crystal-clear wideband audio, a full-duplex speakerphone, and a 3.28-inch grayscale display for streamlined call handling.Supporting one line, this model is ideal for lobbies, meeting areas, classrooms, or administrative desks that require reliable connectivity without unnecessary complexity. With dual 10/100 Ethernet ports, it allows both the phone and a connected PC to share a single network drop. The 7811 operates on Cisco Unified Communications Manager (12.5 and later) or Cisco Hosted Collaboration Solution, and supports advanced calling features like call forwarding, conferencing, and directory integration.Power can be provided via IEEE 802.3af PoE Class 1 or an optional external adapter, making deployment flexible in diverse network environments.

Quick Specs

Parameter

Value

Lines Supported

1

Display

3.28″ (384×106 pixels), greyscale, no backlight

Ethernet

10/100BASE-T (LAN & PC ports)

PoE Class

Class 1 IEEE 802.3af

Audio Codec Support

G.711a/u, G.722, G.722.2, G.729ab, iLBC, OPUS

Speakerphone

Full-duplex

Handset

Narrowband (HAC compliant)

Signaling Protocol

SIP

Dimensions (H×W×D)

207 × 195 × 33 mm (without foot stand)

Weight

806 g

License Requirement

Basic User Connect License (UCL)

Product Front

CP-7800-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

Model Selection Guide – Cisco CP-7811-K9

  • Corporate Reception & Front Desk Operations
  • The CP-7811-K9 is perfect for corporate receptionists and front desk staff who handle visitor inquiries or internal call transfers. Its single-line simplicity reduces operational complexity, while the high-quality audio ensures every conversation is clear and professional. With PoE support, the phone can be deployed without additional power adapters, making it ideal for modern open-space offices.
  • Healthcare Facilities – Nurse Stations & Consultation Rooms
  • In hospitals or clinics, reliability and hygiene are crucial. The CP-7811-K9’s robust build and minimal moving parts make it easy to clean, while the clear audio helps staff communicate with doctors or departments without repeating information. Its single-line design is sufficient for most nurse station workflows, and PoE reduces the need for electrical outlets in busy wards.
  • Retail & Point-of-Sale Environments
  • Retail staff can use the CP-7811-K9 at checkout counters, stockrooms, or store offices to quickly contact suppliers or coordinate with warehouse staff. The compact footprint fits into tight counter spaces, and dual Ethernet ports allow the phone and POS terminal to share the same network cable—saving infrastructure costs.
  • Educational Institutions – Classrooms & Administrative Offices
  • In schools and universities, the CP-7811-K9 is a cost-effective choice for classroom communication or staff offices. It supports essential features like call forwarding and voicemail without overwhelming users with unnecessary multi-line functions, making it ideal for everyday academic use.
  • Hospitality Industry – Guest Service Desks
  • Hotels and resorts can deploy the CP-7811-K9 in concierge areas or back-office service desks, where simple, reliable voice communication is needed. The full-duplex speakerphone allows hands-free interaction when staff need to check booking systems or assist guests while on a call.

Specifications

Parameter Specification
Model Cisco IP Phone 7811 (CP-7811-K9)
Lines Supported 1
Display 3.28-inch (384×106 pixels), grayscale, non-backlit
Ethernet Ports 2× 10/100BASE-T RJ-45 (LAN and PC ports)
Speakerphone Full-duplex
Codec Support G.711 (A-law/μ-law), G.722, G.722.2, G.729ab, iLBC, OPUS
PoE Support IEEE 802.3af PoE Class 1 (Max 3.84W)
Optional Power Supply Cisco Power Adapter 3 (48V DC, 0.38A)
Call Control Support Cisco Unified Communications Manager 12.5+, Cisco Hosted Collaboration Solution 8.6.2+
Dimensions (H×W×D) 207 × 195 × 33 mm (excluding foot stand)
Weight 806 g
Operating Temperature 0°C to 40°C (32°F to 104°F)
Non-Operating Temperature -10°C to 60°C (14°F to 140°F)
Humidity Operating: 10% to 90%, non-condensing
Certifications CE, UL 60950, CSA, EN55022, FCC Part 15 Class B

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Quality Certifications

Customer Reviews

Write A Review
4.7
(3 reviews)
5 Stars
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1
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1 Stars
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    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.

    Office Admin
    Posted on 05/02/2024
    Verified Buyer
    5.0

    Basic phone for the breakroom. Works fine with CUCM.

Questions & Answers

  • Why is the Cisco CP-7811-K9 popular for large, budget-sensitive rollouts?

    It is the most economical enterprise-grade desk phone with HD audio and essential features. Ideal for common areas, manufacturing floors, and basic office roles.
  • Is CP-7811-K9 compatible with CUCM and Webex Calling?

    Yes. It registers to both, covering standard calling features and voicemail access.
  • Does CP-7811 support PoE?

    Yes, very low PoE class, making it easy on closet power budgets.
  • Headset options?

    RJ-9 wired headsets work. For USB or Bluetooth, consider 88xx series.
  • Security posture?

    TLS/SRTP and 802.1X supported; signed firmware ensures integrity.
  • Wall-mounting support?

    Yes, with optional kits. Often used in hallways and shared spaces.
  • Gigabit passthrough?

    Model dependent; verify SKU capabilities if PC passthrough is required.
  • Deployment guidance?

    Standardize templates, enforce voice VLANs, and keep firmware consistent.
  • User training tips?

    Provide quick cards for transfer, hold, and voicemail.
  • Troubleshooting basics?

    Check cabling, VLAN assignments, QoS, and codec settings.

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