The Cisco Desk Phone 9841 (DP-9841-K9) is a brand-new, entry-level SIP desk phone built for Cisco Unified Communications Manager (Unified CM / Call Manager) environments. It features a 3.5-inch backlit grayscale display, four dedicated line keys, a built-in two-port Gigabit Ethernet switch with PoE, and enterprise-grade security, so no external power is needed. It ships with Cisco's Unified CM firmware and registers directly to a Cisco Unified Communications Manager cluster over SIP.
Key Features
- 3.5" backlit grayscale LCD (384 x 160) display
- 4 dedicated backlit line keys for Cisco Unified Communications Manager registration
- Full-duplex speakerphone with background noise removal on outgoing audio
- Hearing Aid Compatible (HAC) handset, ADA and Section 508 compliant
- 1 USB-A port for wired headset connectivity
- Built-in 2-port Gigabit Ethernet switch (network + PC passthrough) with PoE, no external power needed
- Enterprise security: TPM 2.0, Secure Boot, image authentication, SUDI, TLS 1.3, 802.1X supplicant
- Broad audio codec support: G.711, G.722, G.722.2, G.729ab, iLBC, iSAC, Opus
Technical Specifications
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Model: Cisco DP-9841-K9 (Desk Phone 9841, Unified CM Firmware)
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Condition: New
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Color: Carbon Black
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Display: 3.5" grayscale LCD, 384 x 160
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Connectivity: 2x Gigabit Ethernet (RJ45, integrated switch); no Wi-Fi or Bluetooth
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USB: 1x USB-A port (0.25A/5V under PoE; 0.5A/5V with local power adapter)
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Power: PoE IEEE 802.3af (Class 2); optional AC power adapter (sold separately)
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Call control platform: Cisco Unified Communications Manager (Unified CM / Call Manager) only
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Signaling protocol: SIP (registers to Cisco Unified CM)
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Lines: 4 dedicated line keys
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Ports: 1x RJ9 handset, auxiliary port (console logging), 1x USB-A
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Dimensions/Weight: 8.4 x 8.4 x 1.9 in.; 2.10 lb (954 g)
What's in the Box
Desk phone, handset, handset cable, foot stand, Ethernet cable, and quick-start guide. AC power adapter not included.
Frequently Asked Questions
Is the Cisco DP-9841-K9 compatible with Webex Calling, BroadWorks, or Asterisk?
No. This unit ships with Cisco's Unified CM firmware, which registers only to Cisco Unified Communications Manager (Call Manager). A separate firmware/platform load is required for Webex Calling, BroadWorks, or other SIP platforms.
Does the Cisco 9841 support Wi-Fi or Bluetooth?
No. The 9841 is a wired-only desk phone with no wireless radios. If you need Wi-Fi and Bluetooth, see the Cisco Desk Phone 9861 (DP-9861-K9).
What's the difference between the 9841 and the 9851/9861?
The 9841 is the entry-level model with a grayscale display, 4 line keys, and a single USB-A port. The 9851 adds a color display, 6 line keys, USB-C, and support for one Key Expansion Module. The 9861 adds a larger 5" color display, 10 line keys, Wi-Fi, Bluetooth 5.2, and support for up to three Key Expansion Modules.
Does the Cisco 9841 phone require a separate power adapter?
No. It supports Power over Ethernet (802.3af, Class 2), so it can be powered directly through a PoE switch. An AC adapter is available separately if PoE isn't an option.
Is this unit new or refurbished?
This Cisco DP-9841-K9 is brand new, factory-sealed stock.
