Cisco DP-9851-L-K9 Desk Phone 9851 First Light White VoIP TPM 2.0 6-Line PoE NEW For Sale

Cisco DP-9851-L-K9 Desk Phone 9851 First Light White VoIP TPM 2.0 6-Line PoE NEW
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Cisco DP-9851-L-K9 Desk Phone 9851 First Light White VoIP TPM 2.0 6-Line PoE NEW:
$199.99

The Cisco Desk Phone 9851 (DP-9851-L-K9) in First Light (white) is an enterprise VoIP desk phone from the Cisco Desk Phone 9800 Series, running Cisco PhoneOS. It features a 3.7-inch backlit color LCD (480 x 240), 6 physical line keys, dual Gigabit Ethernet (PoE Class 3), plus USB-A and USB-C ports. Security includes Trusted Platform Module (TPM) 2.0 hardware, TLS 1.3, Secure Boot, Image Authentication, and SRTP. Per Cisco, the 9800 Series is supported with Cisco Unified Communications Manager (CUCM), Webex Calling, Webex Dedicated Instance, and BroadWorks; additional series-level platform interop claims are detailed in the specifications section below.

Cisco Desk Phone 9851 (DP-9851-L-K9) - Key Features & Benefits
  • TPM 2.0 Hardware-Rooted Security: Built with Trusted Platform Module (TPM) 2.0 hardware, TLS 1.3, Secure Boot, Image Authentication, Secure Unique Device Identifier (SUDI), and SRTP media encryption — the security stack stated by Cisco for the Desk Phone 9800 Series
  • 3.7" Backlit Color LCD & 6 Physical Line Keys: Bright 3.7-inch color LCD at 480 x 240 resolution with 6 dedicated physical line keys; the Cisco datasheet also states a maximum of 46 line and programmable line keys across the device, including programmable softkeys on the display (see specifications and FAQ)
  • Cisco HD Audio with AI Background Noise Removal: Per Cisco, the 9851 includes AI-based Background Noise Removal (BNR) for outgoing audio, an enhanced speaker with bass-enhancing acoustic enclosure, and the full Cisco smart audio stack (AEC, AGC, VAD, PLC, AJB). Availability of AI BNR can depend on firmware version and registered platform
  • One Phone, Many Platforms - Cisco PhoneOS: Runs Cisco PhoneOS; per the Cisco Desk Phone 9800 Series datasheet, the series is supported with Cisco Unified Communications Manager (CUCM), Webex Calling, Webex Dedicated Instance, and BroadWorks. See the specifications section for the full Cisco-published platform list
  • Dual Gigabit Ethernet, PoE Class 3, USB-A & USB-C: Internal 2-port 10/100/1000BASE-T Cisco Ethernet switch (RJ-45) with IEEE Power over Ethernet Class 3, plus USB-A (also used by the Cisco Desk Phone 9800 Key Expansion Module, sold separately) and USB-C (0.5A / 5V / 2.5W output per Cisco)
  • Hearing Aid Compatible & ADA Accessible: Per Cisco, the wideband-capable handset is Hearing Aid-Compatible (HAC) and meets Federal Communications Commission (FCC Part 68) requirements for the Americans with Disabilities Act (ADA); ADA-compliant dial pad and Voice response in English, French, Italian, German, and Spanish
  • ENERGY STAR & Sustainable Design: ENERGY STAR certified, built with over 74% post-consumer recycled (PCR) plastic per Cisco, plus EU Lot-6 / Lot-26 compliance, deep sleep and display-off power modes
Cisco Desk Phone 9851 (DP-9851-L-K9) - Technical Specifications
  • Manufacturer: Cisco • Series: Cisco Desk Phone 9800 Series
  • Part Number: DP-9851-L-K9 • Color: First Light (White)
  • Product Type: Enterprise VoIP IP Desk Phone
  • Display: 3.7" color LCD, 480 x 240 resolution, backlit
  • Physical Line Keys: 6 (dedicated line buttons on the device)
  • Line & Programmable Line Keys (Maximum, per Cisco): 46 - includes physical keys plus programmable keys across display pages
  • Maximum SIP Line Registrations (per Cisco): 130 on CUCM and Webex Dedicated Instance • 16 on Webex Calling and Open SIP platforms
  • Ethernet: 2 x 10/100/1000BASE-T (RJ-45) with internal Cisco Ethernet switch (IEEE 802.3i / 802.3u / 802.3ab); 802.1Q VLAN support
  • USB-A Port: 0.5A / 5V / 2.5W under PoE; 1A / 5V / 5W with Cisco Power Adapter 3 (per Cisco)
  • USB-C Port: 0.5A / 5V / 2.5W under PoE or with Cisco Power Adapter 3 (per Cisco)
  • Wireless: None (wired Ethernet only - no Wi-Fi, no Bluetooth)
  • Power: IEEE Power over Ethernet Class 3 • Input rating 0.42A at 48V DC • Optional Cisco Power Adapter 3 (sold separately)
  • Audio Processing: Cisco HD audio • AEC, AGC, VAD, PLC, AJB • AI-based Background Noise Removal (BNR) for outgoing audio (per Cisco) • Bass-enhancing acoustic enclosure
  • Audio Codecs: OPUS, G.722, G.722.2, iSAC, G.711 (a-law / µ-law), G.729a/b, iLBC (per Cisco)
  • Handset: Wideband-capable • Hearing Aid-Compatible (HAC), meets FCC Part 68 for ADA (per Cisco)
  • Network Protocols: SIP, SDP, RTP, RTCP, SRTP • IPv4 / IPv6 • DHCP, DNS, HTTPS, LLDP-MED, 802.1x (EAP-FAST, EAP-TLS)
  • Security: TPM 2.0, TLS 1.3, Secure Boot, Image Authentication, SUDI, SIP OAuth • Per Cisco Desk Phone 9800 Series datasheet: "FIPS 140-2, 140-3 and UCR 2013 compliant" (series-level)
  • Operating System: Cisco PhoneOS
  • Platform Support (per Cisco Desk Phone 9800 Series datasheet - series-level interop claims):
    • Cisco Unified Communications Manager (CUCM, 12.5+) - "Interoperability Tested and Certified"
    • Cisco Webex Calling - "Interoperability Tested and Certified"
    • Webex Dedicated Instance (DI) - "Interoperability Tested and Certified"
    • Cisco BroadWorks - "Interoperability Tested and Certified"
    • Asterisk - "Interoperability Tested and Certified"
    • Microsoft SIP Gateway - "Microsoft SIP Gateway (H x W x D): 8.9 x 8.4 x 1.9 in. (226.0 x 214.0 x 49.4 mm)
    • Weight: 968 g (2.13 lb)
    • Operating Temperature: 32 to 104°F (0 to 40°C)
    • Sustainability: ENERGY STAR certified • Over 74% post-consumer recycled (PCR) plastic • EU Lot-6 / Lot-26 (per Cisco)
    • Condition: New
    Cisco Desk Phone 9851 (DP-9851-L-K9) - Frequently Asked Questions (FAQ)
    • What is the difference between DP-9851-L-K9 and DP-9851-K9?
      The only difference is color. The DP-9851-L-K9 ships in First Light (white), while the DP-9851-K9 ships in Carbon Black. Hardware specs, ports, security features, and platform support are identical between the two color variants.
    • Does the 9851 support Wi-Fi or Bluetooth?
      No. The Cisco Desk Phone 9851 is wired Ethernet only. Per the Cisco Desk Phone 9800 Series datasheet, Wi-Fi and Bluetooth are exclusive to the 9861 and 9871 (excluding no-radio variants). If wireless connectivity is required, those are the correct SKUs.
    • How many lines does the 9851 actually have?
      It has 6 physical line keys — these are the dedicated buttons next to the display. The Cisco datasheet also references a maximum of 46 line and programmable line keys, which counts the physical keys plus additional programmable keys reachable through pages or softkeys on the display. Separately, the maximum number of backend SIP line registrations depends on the call platform — up to 130 on CUCM and Webex Dedicated Instance, or up to 16 on Webex Calling and Open SIP platforms (all per Cisco).
    • Which call platforms does the 9851 work with?
      Per the Cisco Desk Phone 9800 Series datasheet, the series is supported with Cisco Unified Communications Manager (CUCM 12.5+), Webex Calling, Webex Dedicated Instance, BroadWorks, and Asterisk (Cisco labels these "Interoperability Tested and Certified"), and is listed as "Microsoft SIP Gateway Compatible". These are Cisco's series-level claims for the 9800 family as a whole; they are not separate per-model certifications and are not a guarantee for every specific deployment, distribution, or third-party PBX. Specific environments should be validated with your call platform provider before purchase.
    • How is the 9851 powered?
      The 9851 is powered via IEEE Power over Ethernet (PoE) Class 3 from a PoE-capable switch or injector (input rating 0.42A at 48V DC). For non-PoE installations, a Cisco Power Adapter 3 is supported — sold separately by region (e.g., CP-PWR-ADPT-3-NA= for North America).
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