CP-7821-K9 – Cisco IP Phone – VoIP Phone

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Weight 1.2 kg
Dimensions 25 × 28 × 8 cm

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CP-7821-K9 Description

The Cisco IP Phone 7821 (CP-7821-K9) delivers cost-effective, secure, and reliable VoIP communication for small to large businesses. As part of the Cisco 7800 Series, it supports two lines, making it ideal for environments where users need to manage multiple calls without excessive complexity.Equipped with a 3.5-inch backlit grayscale display and intuitive navigation keys, the 7821 offers a user-friendly interface for accessing corporate directories, call history, and advanced calling features such as conferencing, call forwarding, and voicemail.With dual 10/100 Ethernet ports, the phone allows both the endpoint and a connected PC to share the same network connection, reducing infrastructure costs. It supports wideband audio for crystal-clear conversations and PoE Class 1 for simplified deployment without additional power adapters. Compatible with Cisco Unified Communications Manager (12.5 and later) and Cisco Hosted Collaboration Solution, the CP-7821-K9 is built for long-term enterprise-grade performance.

Quick Specs

Parameter

Specification

Lines Supported

2

Display

3.5-inch (396×162 pixel) grayscale, white backlight

Ethernet Ports

2× 10/100BASE-T RJ-45 (LAN & PC)

Codec Support

G.711 (A-law/μ-law), G.722, G.722.2, G.729ab, iLBC, OPUS

Speakerphone

Full-duplex

Headset Port

RJ-9 wideband-capable

PoE

IEEE 802.3af Class 1 (Max 3.84W)

Power Supply (Optional)

Cisco Power Adapter 3 (48V DC, 0.38A)

Dimensions (H×W×D)

207 × 206 × 28 mm (excluding foot stand)

Weight

867 g

Operating Temperature

0°C to 40°C (32°F to 104°F)

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-7821-K9

  • Corporate Mid-Level Offices
    Designed for professionals who frequently handle multiple calls, the CP-7821-K9’s two-line capability allows for managing direct lines and shared departmental lines without extra hardware. The backlit display ensures visibility in various lighting conditions, enhancing productivity during extended work hours.
  • Customer Service & Call Centers
    In small to medium-sized call centers, the CP-7821-K9 offers an affordable way to equip agents with reliable VoIP phones that support essential call-handling features, including call forwarding, conferencing, and corporate directory access.
  • Healthcare Administrative Areas
    Hospital administrative desks and clinic reception areas benefit from the phone’s durability and easy-to-read backlit screen, enabling staff to quickly check patient call logs or connect to different departments without delay.
  • Retail Store Managers & Inventory Offices
    Store managers can use the CP-7821-K9 to coordinate with suppliers, handle customer service calls, and manage in-store communications. The dual Ethernet ports allow the phone and a workstation to operate from a single network drop, reducing wiring complexity.
  • Educational Institution Staff Rooms
    University and school administrative teams can leverage the 7821’s simple two-line setup to handle both internal and external communications efficiently, with features like voicemail and call transfer simplifying day-to-day operations.

Specifications

Parameter Specification
Model Cisco IP Phone 7821 (CP-7821-K9)
Lines Supported 2
Display 3.5-inch (396×162 pixels), grayscale, white backlight
Ethernet Ports 2× 10/100BASE-T RJ-45 (LAN and PC ports)
Speakerphone Full-duplex
Headset Port RJ-9 wideband-capable
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 × 206 × 28 mm (excluding foot stand)
Weight 867 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

Get More Information

Discover unbeatable prices and fast shipping for the CP-7821-K9 Access the detailed CP-7821-K9 datasheet and ensure you’re getting the best deal with our reliable delivery service. Need assistance? Our free live chat support is here to help. For more information about the product and pricing, contact us via Live chat or email us at [email protected]

Quality Certifications

Customer Reviews

Write A Review
5.0
(4 reviews)
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4 Stars
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2 Stars
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1 Stars
0
    Daryl Dixon
    Posted on 22/08/2024
    Verified Buyer
    5.0

    Tough phone. Simple. Works.

    VoIP Admin
    Posted on 10/04/2024
    Verified Buyer
    5.0

    Workhorse of our support center. Audio is crisp. Shipping to Philippines was reasonable.

    Purchasing
    Posted on 18/01/2024
    Verified Buyer
    5.0

    Good price per unit on the 10-pack.

    Glenn Rhee
    Posted on 12/11/2023
    Verified Buyer
    5.0

    Fast delivery! Box was in perfect shape.

Questions & Answers

  • Who should deploy Cisco CP-7821-K9 instead of CP-7841 or CP-8851?

    CP-7821 suits budget-conscious users needing two programmable keys and HD audio. It’s great for labs, shared spaces, and basic desk roles.
  • Is CP-7821-K9 compatible with CUCM and Webex Calling?

    Yes. It supports core telephony on both platforms, simplifying hybrid migrations.
  • Does CP-7821-K9 support PoE?

    Yes, Class 1–2. It’s power efficient, fitting dense floors without straining PoE budgets.
  • Are headsets supported?

    RJ-9 headsets work. For advanced headset features, consider higher 88xx models.
  • Security features?

    TLS/SRTP, 802.1X, and signed firmware keep communications secure.
  • Wall-mounting?

    Supported with optional hardware. Useful for corridors and utility rooms.
  • How to manage many devices?

    Use auto-registration templates, standardized button layouts, and firmware baselines.
  • Any gigabit passthrough?

    Yes, gigabit passthrough is available on many variants; confirm your SKU.
  • Deployment tips?

    Segment voice VLANs, enforce QoS, and pre-provision extensions.
  • Troubleshooting?

    Check codec selection, QoS trust, and handset or cord faults.

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