CP-7821-K9 – Two-Line IP Phone – 10/100 Ethernet – PoE Class 1
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CP-7821-K9 Description
CP-7821-K9 is a Cisco IP Phone 7821 desk phone in the Cisco IP Phone 7800 Series for two-line IP voice endpoints on Cisco-supported call-control platforms. It combines two programmable line keys, a 3.5 in. 396 x 162 pixel grayscale display, 10/100BASE-T LAN and downstream-device Ethernet ports, IEEE 802.3af Class 1 PoE, and Basic User Connect License support for Cisco Unified Communications Manager 12.5 and later.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
CP-7821-K9 |
|
Product type |
Cisco IP Phone 7821 desk phone |
|
Supported line keys |
2 |
|
Display |
3.5 in. 396 x 162 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 |
|
Handset and headset |
Wideband-capable RJ-9 handset and RJ-9 analog headset port |
|
Dimensions and weight |
207 x 206 x 28 mm, 867 g |
Application Scenarios
Deploy CP-7821-K9 where a desk user needs two line appearances or feature keys, but the site does not require the four-line layout or Gigabit Ethernet pass-through of the 7841 model.
Use this SKU in Cisco Unified Communications Manager environments where the bill of materials is planned around Basic User Connect License entitlement for the 7811 and 7821 phone tier.
Fit CP-7821-K9 into access networks that provide IEEE 802.3af Class 1 PoE and 10/100BASE-T connectivity for the phone plus an optional downstream Ethernet device.
Product Comparison
|
Parameter |
CP-7821-K9 | ||
|---|---|---|---|
|
Cisco ordering ID |
CP-7821-K9= |
CP-7811-K9= |
CP-7841-K9= |
|
Cisco model description |
Cisco IP Phone 7821 |
Cisco IP Phone 7811 |
Cisco IP Phone 7841 |
|
Supported line keys |
2 |
0 |
4 |
|
Color availability |
Charcoal and white |
Charcoal only |
Charcoal and white |
|
Display |
3.5 in. 396 x 162 pixels |
3.28 in. 384 x 106 pixels |
3.5 in. 396 x 162 pixels |
|
Ethernet switch |
10/100BASE-T |
10/100BASE-T |
10/100/1000BASE-T |
|
CUCM license |
Basic User Connect License |
Basic User Connect License |
Enhanced User Connect License |
|
PoE class |
IEEE 802.3af Class 1 |
IEEE 802.3af Class 1 |
IEEE 802.3af Class 1 |
|
Approximate weight |
867 g |
806 g |
868 g |
- In a CP-7821-K9 vs CP-7811-K9 comparison, the practical difference is the two-line 7821 layout because CP-7811-K9 has no supported line keys.
- The CP-7821-K9 vs CP-7841-K9 difference combines line-key count, Ethernet speed, and CUCM license tier: CP-7841-K9 has four line keys, 10/100/1000BASE-T Ethernet, and Enhanced UCL.
- For buyers deciding which model to choose, the CP-7821-K9 comparison should confirm whether two line keys and 10/100 Ethernet satisfy the desk profile before moving to the 7841 model.
Selection Guide
1. Match the phone to the user’s line-key count
Choose CP-7821-K9 when the user position needs two supported line keys. Stay with CP-7811-K9 only for positions that do not need programmable line-key buttons.
2. Keep Gigabit pass-through out of this SKU
Select CP-7841-K9 instead when the desktop design requires 10/100/1000BASE-T Ethernet for the phone and downstream device.
3. Confirm the CUCM licensing tier
Use CP-7821-K9 when the Cisco Unified Communications Manager bill of materials is built around Basic User Connect License entitlement for the 7821 model.
4. Separate power and color decisions
Check whether the desk will use IEEE 802.3af PoE or Cisco Power Adapter 3, then confirm whether the standard charcoal model or the separate CP-7821-W-K9 white model is required.
Ordering Checklist
|
Check Item |
Confirmation Needed |
Procurement Risk |
|---|---|---|
|
Phone identity |
CP-7821-K9 and Cisco orderable PID CP-7821-K9= |
Prevents a two-line 7821 request from being filled with a 7811, 7841, or 7861 phone |
|
Line-key requirement |
Two supported line keys on Cisco IP Phone 7821 |
Confirms the user position needs the 7821 layout rather than a no-line-key or four-line model |
|
Voice platform baseline |
Cisco Unified Communications Manager 12.5+, Cisco Hosted Collaboration Solution 8.6.2+, or Cisco SRST 8.x+ |
Keeps deployment planning tied to Cisco-documented call-control support |
|
CUCM entitlement |
Basic User Connect License |
Separates the 7821 license tier from the Enhanced UCL requirement of higher 7800 Series models |
|
Desk power source |
IEEE 802.3af Class 1 PoE or Cisco Power Adapter 3 |
Avoids approving the handset without a documented local power method |
|
Desktop Ethernet path |
10/100BASE-T phone switch with LAN and downstream-device RJ-45 ports |
Flags orders that actually need 10/100/1000BASE-T pass-through |
|
Color and mount extras |
Charcoal CP-7821-K9, separate CP-7821-W-K9 if white is required, and optional 7800 wall-mount kit |
Keeps color and mounting accessories visible as separate order decisions |
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-7821-K9 | Cisco ordering ID | CP-7821-K9= |
| Product type | Cisco IP Phone 7821 desk phone | Supported line keys | 2 |
| Display | 3.5 in. 396 x 162 pixel grayscale display | Ethernet switch | 10/100BASE-T with two RJ-45 ports |
| PoE class | IEEE 802.3af Class 1 | 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 | Handset | Wideband-capable RJ-9 handset |
| Headset port | Wideband-capable RJ-9 analog headset port | Speakerphone | Full-duplex speakerphone |
| Foot-stand positions | 30 degrees and 45 degrees | Wall mounting | Optional wall-mount kit |
| Dimensions | 207 x 206 x 28 mm excluding foot stand | Weight | 867 g |
| Operating temperature | 32 to 104 degrees F (0 to 40 degrees C) | Operating humidity | 10% to 90%, non-condensing |
| Phone casing composition | Polycarbonate ABS textured plastic | Color options | Charcoal base model, separate white SKU available |
Get More Information
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Questions & Answers
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What role does CP-7821-K9 serve?
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How is CP-7821-K9 different from CP-7811-K9?
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Does CP-7821-K9 work with Cisco call control?
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What user profile fits CP-7821-K9?
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Can CP-7821-K9 handle receptionist workloads?
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What network issue affects CP-7821-K9 registration?
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Does CP-7821-K9 need PoE?
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What migration check matters for CP-7821-K9?
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