DP-9841-K9 – 4 Line Keys – 3.5in Grayscale Display – Gigabit PC Passthrough
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DP-9841-K9 Description
The DP-9841-K9 is a Cisco Desk Phone 9841, a wired desk phone in the Desk Phone 9800 Series for everyday office desks. The phone has a 3.5-inch backlit grayscale LCD at 384 x 160, 4 physical line keys, a 2-port 10/100/1000BASE-T Ethernet switch, one USB-A port and a TPM 2.0 chip, and it draws IEEE 802.3af/at PoE Class 2 power. The phone has no Wi-Fi or Bluetooth radio and does not accept the 9800 Key Expansion Module.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
DP-9841-K9 (Cisco ordering ID DP-9841-K9=) |
|
Display |
3.5-inch backlit grayscale LCD, 384 x 160 |
|
Line keys |
4 physical line keys, 4-line capacity |
|
Ethernet ports |
Internal 2-port 10/100/1000BASE-T switch with PC passthrough |
|
PoE class |
IEEE 802.3af/at Class 2 |
|
Local power option |
Cisco Power Adapter 3, ordered separately by region |
|
Call control support |
CUCM, Webex Calling, Webex Dedicated Instance, Cisco BroadWorks, third-party SIP platforms |
|
USB port |
1x USB-A headset port |
|
Wireless radios |
None (no Wi-Fi, no Bluetooth) |
Application Scenarios
Across cubicles and private offices, the phone is the daily extension, registered to Unified Communications Manager or Webex Calling for internal and external calls.
In shared-desk zones, staff sign in to the phone for a shift through Webex hot desking, and the next person signs in when the desk is released.
On finance and government floors with compliance rules, the phone’s FIPS 140-2/140-3 validation, TLS 1.3 signaling, SRTP media and TPM 2.0 identity meet the security baseline at each desk.
Product Comparison
|
Parameter |
DP-9841-K9 | ||
|---|---|---|---|
|
Display |
3.5-inch backlit grayscale LCD, 384 x 160 |
2.6-inch grayscale LCD, 256 x 132 |
3.7-inch backlit color LCD, 480 x 240 |
|
Physical line keys |
4 |
2 |
6 |
|
Line and programmable key capacity |
4 |
2 |
46 |
|
Ethernet |
2-port 10/100/1000BASE-T |
2-port 10/100BASE-T |
2-port 10/100/1000BASE-T |
|
USB port |
1x USB-A |
No USB port |
1x USB-A, 1x USB-C |
|
Key expansion |
Not supported |
Not supported |
1 Key Expansion Module |
|
Power over Ethernet |
IEEE 802.3af/at, Class 2 |
IEEE 802.3af/at, Class 2 |
IEEE 802.3af/at, Class 3 |
|
Hardware security module |
TPM 2.0 |
Not equipped (SUDI protected by SoC) |
TPM 2.0 |
|
Minimum unified CM release |
12.5 |
14 |
12.5 |
DP-9841-K9 is the 4-line gigabit model: against DP-9811-K9 it adds a 10/100/1000BASE-T pass-through port, TPM 2.0, a USB-A port and a wideband handset with transmit-side noise removal, all at PoE Class 2. A desk with a gigabit PC behind the phone, or a TPM 2.0 requirement, rules out DP-9811-K9, which also needs Unified CM 14 or later where DP-9841-K9 registers from 12.5. Desks that need more than 4 lines, a USB-C port, a color display or a Key Expansion Module move to DP-9851-K9, with 6 line keys and 46 lines at PoE Class 3.
Ordering Checklist
- Power source: Add Cisco Power Adapter 3 in the regional PID, such as CP-PWR-ADPT-3-NA= or CP-PWR-ADPT-3-EU=, for desks without PoE. The phone draws PoE Class 2 and does not ship with a power adapter.
- TAA or Customized build: Order DP-9841-K9++= (NFC) or DP-9841NR-K9++= (NoNFC) for TAA; DP-9841-K9–= or DP-9841NR-K9–= for Customized. These builds are separate PIDs from DP-9841-K9=.
- Wall mount: Add DP-9800-WMK= for wall-mounted installs; the kit is a separate accessory.
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | DP-9841-K9 (Cisco ordering ID DP-9841-K9=) | Product series | Cisco Desk Phone 9800 Series |
| Software | Cisco PhoneOS | Ordering variants | First Light DP-9841-L-K9=; TAA DP-9841-K9++= (NFC) / DP-9841NR-K9++= (NoNFC); Customized DP-9841-K9–= / DP-9841NR-K9–= |
| Display | 3.5-inch backlit grayscale LCD, 384 x 160 | Line keys | 4 physical line keys; line and programmable key capacity 4 |
| Fixed keys | Conference, Directory, Action button, Hold/Resume, Transfer, Favorite, Application, volume, speakerphone, headset, and mute keys | Navigation | 4-way navigation cluster with Select key |
| Status indicators | Front Arc LED and Top 360 LED | Ethernet ports | Internal 2-port 10/100/1000BASE-T switch, RJ-45 PC passthrough |
| VLAN support | 802.1Q separate voice and PC VLANs | Headset port | 1x USB-A headset port |
| Handset port | 1x RJ-9 handset port | Auxiliary port | 1x auxiliary port for console log capture |
| USB power output | 5V/0.25A (1.25W) on PoE; 5V/0.5A (2.5W) on local power | Wireless radios | No Wi-Fi, no Bluetooth; key expansion module not supported |
| Call control platforms | Cisco Unified Communications Manager, Webex Calling, Webex Dedicated Instance, Cisco BroadWorks, third-party SIP platforms; Microsoft SIP Gateway Compatible; Asterisk interoperability certified | Minimum CUCM release | Unified CM 12.5 or later; device package required on some CUCM versions |
| SIP line capacity | Platform maximum 130 lines on CUCM and Webex Dedicated Instance, 16 on Webex Calling and open SIP platforms, bounded by the 4-line key capacity | Audio codecs | OPUS, G.722, G.722.2, iSAC, G.711 a-law/u-law, G.729a/b, iLBC |
| Handset | Wideband handset included, RJ-9 connected, hearing aid compatible (FCC Part 68 / ADA) | Speakerphone | Full-duplex speakerphone |
| AI audio | Transmit-side background noise removal; ultrasound support | Calling features | Call waiting, hold/resume, music on hold, forward, transfer, conference, speed dial, BLF, call pickup, call park, hunt groups, shared lines, voicemail, E.911, intercom, recording, Extension Mobility (varies by platform) |
| Webex integration | Unified call history, unified directory, hybrid calendar, one-button-to-push, Webex Companion, hot desking | Programmable Action button | Up to 3 configured actions, including emergency alerting, paging, and web application triggers |
| Network features | SIP signaling, IPv4/IPv6, DHCP or static addressing, 802.1x (EAP-FAST/EAP-TLS), LLDP-MED, CDP, HTTPS, RTP/RTCP | Security | Secure Boot, image authentication, SUDI, TPM 2.0, TLS 1.3 signaling encryption, SRTP media encryption, Security-Enhanced Linux, configurable minimum TLS version |
| Security compliance | FIPS 140-2/140-3; UCR 2013 | Power | IEEE 802.3af/at PoE Class 2, rated input 0.42A at 48V DC; optional Cisco Power Adapter 3 by region |
| Low-power modes | Display off 1.95W (PoE) / 2.35W (local power); deep sleep 0.61W (PoE) / 0.26W (local power) | Energy certification | EnergyStar certified; EU Lot-6/Lot-26 compliant |
| Operating temperature | 0 to 40°C | Operating humidity | 10-90% non-condensing |
| Dimensions | 214.0 x 214.0 x 49.4 mm | Weight | 954 g |
| Spare parts | Footstand DP-9800-FS=; handset DP-9800-HS=; handset cord DP-9800-CORD= | Mounting accessories | Wall-mount kit DP-9800-WMK=; 8800-position adapter DP-9800-WMK-88ADP= |
| Language support | About 40 languages, including English, French, German, Spanish, Japanese, Korean, and Simplified and Traditional Chinese | Accessibility | Voice Feedback in 5 languages; adjustable font size; ADA-compliant dial pad |
| Sustainability | More than 74% post-consumer recycled plastic; 100% recyclable packaging |
Get More Information
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Customer Reviews
Questions & Answers
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What type of desk phone is DP-9841-K9?
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How many lines does DP-9841-K9 support, and what display does it use?
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Does DP-9841-K9 accept the DP-9800-KEM expansion module?
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Which network interface connects a PC through DP-9841-K9?
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How does DP-9841-K9 power demand compare with DP-9851-K9?
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Which hardware anchors device identity on DP-9841-K9?
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Which capabilities does DP-9841-K9 add over DP-9811-K9?
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When should a deployment move beyond DP-9841-K9?
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