CP-8821-K9 – 8821 Wireless IP Phone – Device Only – 802.11a/b/g/n/ac VoWLAN

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CP-8821-K9 Description

The CP-8821-K9 is a Cisco Wireless IP Phone 8821 handset for mobile voice users on Wi-Fi networks in warehouses, retail floors and healthcare spaces. The handset runs IEEE 802.11a/b/g/n/ac with six lines, a 2.4-inch 240 x 320 color display, IP54 protection and up to 11.5 hours of talk time on a 2060 mAh battery. The handset carries no hazardous-location listing, and the battery and power adapter come separately.

Quick Specs

Parameter

Specification

Product ID

CP-8821-K9

Cisco ordering description

Cisco Wireless IP Phone 8821 World mode device ONLY

Product type

Cisco wireless IP phone handset

Bundle scope

Device-only order line

Wireless standards

IEEE 802.11a/b/g/n/ac

Call-control support

Cisco Unified Communications Manager 9.1(2), 10.5(2), 11.0(1), and later

Access point support

Cisco unified AP minimum 8.0.121.0, Cisco autonomous AP minimum 12.4(21a)JY, and Cisco Meraki APs

Display

2.4 in. color display, 240 x 320 pixels

Protection and durability

IP54 rating with MIL-STD-810G drop and vibration procedures

Battery specification

Rechargeable Lithium ion 4.35V, 2060mAh smart battery

Audio and headset

Built-in full-duplex speakerphone, Bluetooth headset support, and 3.5 mm headset jack

Application Scenarios

Warehouse Picking Floor

Pickers and supervisors in a warehouse can carry the handset on a Cisco wireless network, and the IP54 rating with MIL-STD-810G drop testing suits repeated knocks on concrete floors.

Hospital Nursing Units

Nurses and care staff on hospital wards can take calls on the handset while moving between rooms, with 802.11r fast roaming keeping calls connected across access points.

Retail Store Floor

Store associates in a large retail space can reach each other and the back office through the handset’s speakerphone, six lines and Bluetooth headset support.

Product Comparison

Parameter

CP-8821-K9

CP-8821-EX-K9=

CP-8861-K9

Display

2.4 in. 240 x 320 color

2.4 in. 240 x 320 color

5 in. 800 x 480 24-bit color WVGA

Line appearances

6

6

5 programmable line and feature keys

Wireless standards

IEEE 802.11a/b/g/n/ac

IEEE 802.11a/b/g/n/ac

IEEE 802.11a/b/g/n/ac

Bluetooth

Bluetooth SW 3.0 HW 4.0

Bluetooth SW 3.0 HW 4.0

Bluetooth 3.0 EDR Class 1, up to 20 m

Ingress protection

IP54

IP67 ordinary locations; IP54 hazardous-location use

Not published

Hazardous-location support

Not published

CSA Class I Division 2 and Class I Zone 2; ATEX Zone 2 Group IIC pending

Not published

Talk time

Up to 11.5 hours

Up to 9.5 hours

Not applicable

Included components

Device only

Device only

Not published

Power over Ethernet

Not applicable

Not applicable

IEEE 802.3at Class 4

CP-8821-K9 is the standard Cisco Wireless IP Phone 8821 handset with a 2.4-inch 240 x 320 display and IP54, and it differs from CP-8821-EX-K9= by hazardous-location listing: the EX handset carries CSA Class I Division 2 and Class I Zone 2 support and IP67 in ordinary locations, so any classified area needs CP-8821-EX-K9=. Because CP-8821-K9 ships without battery or power, CP-8821-K9-BUN, which adds the battery, cord, adapter and country clip, is the simpler order for a first deployment. Users who need a 5-inch 800 x 480 screen instead of the 2.4-inch display need CP-8861-K9, a desk phone with integrated Wi-Fi.

Ordering Checklist

  • Battery: Add CP-BATT-8821=, because CP-8821-K9= is the handset only. The handset cannot run without a battery.
  • Power kit: Add a CP-PWR-8821 kit for the destination, such as -NA=, -CE= or -UK=. The handset-only SKU has no charger or country clip.
  • Chargers and cases: Order desktop chargers, multi-chargers and cases separately, with PIDs in the 882x Accessory Guide. These accessories are not in the SKU.

Specifications

Parameter Specification Parameter Specification
Product ID CP-8821-K9 Cisco ordering ID CP-8821-K9=
Cisco ordering description Cisco Wireless IP Phone 8821 World mode device ONLY Product type Cisco wireless IP phone handset
Bundle comparison SKU CP-8821-K9-BUN includes the device, battery, power cord, power adapter, and country clip EX comparison SKU CP-8821-EX-K9= is Cisco Wireless IP Phone 8821-EX World mode device only
Wireless standards IEEE 802.11a, 802.11b, 802.11g, 802.11n, and 802.11ac Signaling protocol Session Initiation Protocol
Line appearances Six line appearances CUCM support Cisco Unified Communications Manager 9.1(2), 10.5(2), 11.0(1), and later
SRST support Cisco Unified Survivable Remote Site Telephony 10.5, 11.0, 11.5, 11.7, and later Unified CME support Cisco Unified Communications Manager Express 10.5, 11.0, 11.5, 11.7 native support, and later
HCS support Cisco Hosted Collaboration Solution 9.x, 10.x, 11.x, and later Access point support Cisco unified AP minimum 8.0.121.0; Cisco autonomous AP minimum 12.4(21a)JY; Cisco Meraki APs
Wireless security WPA/WPA2 Personal and Enterprise, EAP-FAST, PEAP-GTC, PEAP-MSCHAPv2, EAP-TLS, and AES Fast roaming 802.11r Fast Transition and Cisco Centralized Key Management
QoS support IEEE 802.11e, Wi-Fi Multimedia, TSPEC, TCLAS, EDCA, and QBSS Signature support SHA-1 and SHA-2 signature types
Display 2.4 in. color display with 240 x 320 pixel resolution Application support XML applications such as push-to-talk
Audio codecs G.711a, G.711u, G.729a, G.729ab, G.722, iLBC, and iSAC Audio interfaces Full-duplex speakerphone, Bluetooth SW 3.0 HW 4.0, and 3.5 mm headset jack
Battery specification Rechargeable Lithium ion 4.35V, 2060mAh smart battery Battery runtime Up to 11.5 hours talk time, up to 145 hours auto-scan standby, or up to 45 hours continuous-scan standby
Input power Phone 100 to 240 VAC, approximately 0.2A, 50 to 60 Hz, with AC adapters by region Connector type Magnetic USB 2.0 On The Go connector
Ingress protection IP54 Test standard MIL-STD-810G Drop and Vibration procedures
Drop test Multiple 5 ft drops onto concrete Dimensions Phone 5.2 x 2.2 x 0.7 in. (13.2 x 5.6 x 1.7 cm)
Weight Device 4.4 oz (126 g), battery 1.3 oz (37 g), total 5.7 oz (163 g) Operating temperature Device -10°C to 50°C (14°F to 122°F)
Operating humidity 10% to 95%, noncondensing Operating altitude Certified operation from 0 to 6500 ft (0 to 2 km)
Phone technology license Required for all Cisco IP phones

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Quality Certifications

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    Leila Flores
    Posted on 02/04/2026
    Verified Buyer
    5.0

    Procurement approved a blanket PO with Layer23 based on our experience.

    Scott Lewis
    Posted on 01/03/2026
    Verified Buyer
    4.0

    Our internal vendor satisfaction survey gave Layer23 high marks. Wish the lead time was a bit shorter, but product quality made up for it.

    Theresa Gupta
    Posted on 07/12/2025
    Verified Buyer
    5.0

    Product condition was new, not refurbished. Important distinction for our procurement.

    Dr. Strange
    Posted on 05/09/2024
    Verified Buyer
    5.0

    Wireless connectivity is magical. Battery lasts a whole shift.

    Dr. House
    Posted on 18/06/2024
    Verified Buyer
    5.0

    It’s not Lupus. It’s a good phone. It works. Now go away.

Questions & Answers

  • Does CP-8821-K9 support the 5.500-5.720 GHz UNII-2e band?

    Yes. CP-8821-K9 uses UNII-2e channels 100 to 144, which cover 5.500-5.720 GHz, per the Cisco Wireless IP Phone 8821 WLAN deployment guide. Allow those channels on the access points that serve voice, or the handset cannot roam onto them and will fall back to the other 5 GHz bands.
  • Which 2.4 GHz channels does CP-8821-K9 use, and which are not supported?

    CP-8821-K9 uses 2.412-2.472 GHz, channels 1 to 13. Per the 8821 WLAN deployment guide, 802.11j channels 34, 38, 42 and 46 and Japan channel 14 are not supported, so keep those channels out of the voice channel plan.
  • What is the maximum transmit power of CP-8821-K9?

    CP-8821-K9 transmits up to 14 dBm on 5 GHz 802.11a and 17 dBm on 2.4 GHz 802.11b. Per the 8821 WLAN deployment guide, the 5 GHz VHT limit is 12 dBm, so size access point cells for the lowest of these levels.
  • Is the IP54 rating of CP-8821-K9 a permanent condition?

    No. The ingress rating is a lab result under IEC 60529 and is not a permanent condition, per the Cisco Wireless IP Phone 8821 administration guide. Wear and cleaning can reduce protection, so do not rely on it for wet-wash areas.
  • Which wipes can clean CP-8821-K9 on a hospital ward?

    Caviwipes and Saniwipes with up to 17% isopropanol are recommended for health care. Higher alcohol content can damage CP-8821-K9, and wiping more than 3 times a day damages the coating, per the Cisco Wireless IP Phone 8821 administration guide.

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  • CP-8821-K9 Datasheet