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Charcoal corded IP phone, wall-mountable, monochrome 3.5 inch display, two RJ-45 ports, PoE

Cisco Systems, Inc.

Cisco Systems, Inc. CP-7821-K9= 2-line VoIP telephone Charcoal

SKU CH-62PT-G32Q6 MPN CP-7821-K9=

A corded VoIP desk phone with two lines, a 3.5-inch monochrome display, dual RJ-45 ports and PoE support in a wall-mountable charcoal chassis

  • TypeCorded IP Phone
  • Two simultaneous lines for handling separate calls
  • VoIP operation over standard SIP networks
  • 5 inch monochrome display for clear call details
  • Dual RJ-45 ports with PoE for single-cable deployment
  • Wall-mountable charcoal design saves desk space

Two-line VoIP phone for office desks

The Cisco CP-7821-K9= is a corded IP telephone that supports two simultaneous lines. It connects through two RJ-45 network ports and draws power over Ethernet, so no separate adapter is required. The 3.5 inch monochrome display shows caller ID and call status. A User Connect License is included for provisioning.

Sustained call handling and wall mounting

During long conversations the handset and full-duplex speakerphone remain active without external power. PoE delivers continuous current through the network cable, keeping the phone operational for full work shifts. The wall-mountable chassis measures 8.15 inches high, 8.11 inches wide and 1.10 inches deep, weighing 867 grams for secure installation.

SIP and SRTP over dual Ethernet ports

The phone uses SIP for call control and SRTP for encrypted media streams, both carried on the two RJ-45 interfaces. LDAP and CDP support directory lookup and network discovery within the same link. No wireless, Bluetooth or additional codec licences are provided, limiting connectivity to wired Ethernet infrastructure.

Highlights

  • Two simultaneous lines for handling separate calls
  • VoIP operation over standard SIP networks
  • 5 inch monochrome display for clear call details
  • Dual RJ-45 ports with PoE for single-cable deployment
  • Wall-mountable charcoal design saves desk space

Specifications

BrandCisco
ModelCP-7821-K9=
Part NumberCP-7821-K9=
TypeCorded IP Phone
Shipping weight1.09 kg
Package size279 × 231 × 74 mm

Questions about this item

How much heat and noise does the CP-7821-K9= produce when powered by PoE all day?

The phone draws power through its PoE port and has no fan, so it runs silently and generates only minimal warmth during continuous operation.

What network equipment must I already have to run this 2-line VoIP phone?

You need a PoE-capable switch or injector to supply power over the Ethernet cable, plus a SIP-compatible call-control server or hosted PBX to register the two lines.

Will the CP-7821-K9= work alongside my older analogue handsets on the same PBX?

Yes, as long as the PBX supports SIP endpoints, the Cisco 7821 registers as a standard SIP device and operates in parallel with legacy analogue or digital extensions.

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