CP-7821-K9

CP-7821-K9 is the Cisco IP Phone 7821 desk handset for two-line voice users in the Cisco 7800 Series. The two-line position places it between the one-line and four-line 7800 Series desk models for users who need more than a single appearance but not a larger attendant-style set. The K9 ordering path differs from CP-7821-3PCC-K9, the 7821 variant supplied with Multiplatform Phone firmware for third-party call-control deployments. This wired charcoal desk model uses a monochrome grayscale display, SIP call signaling, Fast Ethernet desk connectivity, a wideband handset, a full-duplex speakerphone, and IEEE 802.3af Class 1 PoE for access-switch powered deployment. It registers to Cisco Unified Communications Manager, Cisco Hosted Collaboration Solution, Cisco Unified Survivable Remote Site Telephony, or Cisco Webex Calling rather than providing standalone dial tone. The replaceable bezel and optional wall-mount kit support standard office placement without changing the endpoint platform.

SIP RFC 3261 signaling carries registration and call setup, while G.711, G.722, G.722.2, G.729ab, iLBC, and OPUS cover the listed codec set. 3.5-inch 396 x 162 grayscale display output presents calling features, directories, XML applications, and status prompts with white backlighting. Two programmable line keys handle directory numbers or feature assignments, with soft keys, fixed feature keys, navigation/select controls, speaker, headset, mute, volume, messaging, service, directory, hold/resume, transfer, and conference controls around the keypad. 10/100BASE-T Ethernet provides separate RJ-45 LAN and downstream-device ports at the desk. IEEE 802.3af Class 1 PoE powers the handset from the access switch, with Cisco Power Adapter 3 used where PoE is unavailable. Full-duplex wideband speakerphone audio supports hands-free conversations, and the RJ-9 headset port fits cabled headset workflows. Automatic gain control and acoustic echo cancellation support consistent audio levels. CP-7821-K9 also supports TLS signaling encryption, SRTP media encryption, 802.1X authentication, CDP, 802.1Q VLAN tagging, and 802.1p QoS marking for voice-network placement.

CP-7821-K9 deploys at ordinary user desks, shared work positions, home offices, and light call-handling stations where two line appearances are enough for the role. Cisco has published end-of-sale milestones for the 7821, so replacement continuity and condition control matter for installed 7800 Series estates. Wall mounting uses the Cisco 7800 Series wall-mount kit, and accessory planning includes the wideband handset, handset cord, foot stand, bezels, headset port, and optional regional power adapters for non-PoE sites. ORM Systems supplies this phone new and certified refurbished for replacement projects, mixed 7800 Series estates, and bulk endpoint rollouts. Refurbished units receive factory reset handling so previous registration settings and directory data are cleared, with keypad, display, handset, speakerphone, headset, Ethernet, and PoE functions checked before dispatch. Request a quote for fleet quantities, matched condition grades, rollout timing, and replacement scheduling across Cisco voice environments.