{"product_id":"cisco-desk-phone-9851-dp-9851-k9-new-color-display-enterprise-sip-desk-phone","title":"Cisco Desk Phone 9851 DP-9851-K9 — New, Color Display Enterprise SIP Desk Phone","description":"\u003cp\u003eThe \u003cstrong\u003eCisco Desk Phone 9851 DP-9851-K9\u003c\/strong\u003e is a brand-new, mid-tier SIP desk phone built for Cisco Unified Communications Manager (Unified CM \/ Call Manager) environments. It features a 3.7-inch backlit color display, six programmable line keys, USB-A and USB-C ports, a built-in two-port Gigabit Ethernet switch with PoE, and support for a Key Expansion Module, 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.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3.7\" backlit color LCD (480 x 240) display\u003c\/li\u003e\n\u003cli\u003e6 programmable line keys, expandable up to 46 keys with one Key Expansion Module\u003c\/li\u003e\n\u003cli\u003eFull-duplex speakerphone with background noise removal on outgoing audio\u003c\/li\u003e\n\u003cli\u003eHearing Aid Compatible (HAC) handset, ADA and Section 508 compliant\u003c\/li\u003e\n\u003cli\u003eUSB-A and USB-C ports for wired headsets and accessories\u003c\/li\u003e\n\u003cli\u003eBuilt-in 2-port Gigabit Ethernet switch (network + PC passthrough) with PoE, no external power needed\u003c\/li\u003e\n\u003cli\u003eEnterprise security: TPM 2.0, Secure Boot, image authentication, SUDI, TLS 1.3, 802.1X supplicant\u003c\/li\u003e\n\u003cli\u003eBroad audio codec support: G.711, G.722, G.722.2, G.729ab, iLBC, iSAC, Opus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Cisco DP-9851-K9 (Desk Phone 9851, Unified CM Firmware)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Carbon Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e 3.7\" color LCD, 480 x 240\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e 2x Gigabit Ethernet (RJ45, integrated switch); no Wi-Fi or Bluetooth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB:\u003c\/strong\u003e 1x USB-A + 1x USB-C (0.5A\/5V each under PoE)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e PoE IEEE 802.3at (Class 3); optional AC power adapter (sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCall control platform:\u003c\/strong\u003e Cisco Unified Communications Manager (Unified CM \/ Call Manager) only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignaling protocol:\u003c\/strong\u003e SIP (registers to Cisco Unified CM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLines:\u003c\/strong\u003e 6 programmable line keys, expandable to 46 keys with one DP-9800-KEM= expansion module (USB-A)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePorts:\u003c\/strong\u003e 1x RJ9 handset, auxiliary port (console logging), 1x USB-A, 1x USB-C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions\/Weight:\u003c\/strong\u003e 8.9 x 8.4 x 1.9 in.; 2.13 lb (968 g)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cp\u003eDesk phone, handset, handset cable, foot stand, Ethernet cable, and quick-start guide. AC power adapter and Key Expansion Module not included.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the Cisco DP-9851-K9 compatible with Webex Calling, BroadWorks, or Asterisk?\u003c\/strong\u003e\u003cbr\u003eNo. 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Cisco 9851 support Wi-Fi or Bluetooth?\u003c\/strong\u003e\u003cbr\u003eNo. The 9851 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).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the 9851 use a Key Expansion Module?\u003c\/strong\u003e\u003cbr\u003eYes. It supports one Cisco 9800 Series Key Expansion Module (DP-9800-KEM=) connected via the USB-A port, adding a 5\" color touch panel with 20 programmable keys across two pages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the Cisco 9851 phone require a separate power adapter?\u003c\/strong\u003e\u003cbr\u003eNo. It supports Power over Ethernet (802.3at, Class 3), so it can be powered directly through a PoE switch. An AC adapter is available separately if PoE isn't an option.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this unit new or refurbished?\u003c\/strong\u003e\u003cbr\u003eThis Cisco DP-9851-K9 is brand new, factory-sealed stock.\u003c\/p\u003e","brand":"Resilient Tec","offers":[{"title":"Default Title","offer_id":48998394331236,"sku":"DP-9851-K9","price":269.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/3482\/4548\/files\/Screenshot2026-08-13163435.png?v=1786653434","url":"https:\/\/resilient-tec.com\/products\/cisco-desk-phone-9851-dp-9851-k9-new-color-display-enterprise-sip-desk-phone","provider":"Resilient Tec","version":"1.0","type":"link"}