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Grey rectangular desk phone with 3.5 inch grayscale display and four line keys

Cisco Systems, Inc.

Cisco Systems, Inc. CP-7841-K9= IP Phone 7841 4 line 3.5" 2x RJ-45 PoE

SKU CH-SVH8-2MH5R MPN CP-7841-K9=

A VoIP desk phone with four lines, a 3.5-inch grayscale display, dual RJ-45 ports and PoE power

  • Additional FeaturesIP Phone Technology: VoIP Total Number of Phone Lines: 4 Cal
  • Four programmable line keys give quick access to telephony features
  • 5 inch high-resolution grayscale display provides clear call information
  • Built-in wideband speakerphone enables hands-free communication
  • Power over Ethernet Class 1 reduces energy costs
  • Integrated 10/100/1000 Ethernet switch supports flexible network deployment

Cisco IP Phone 7841 overview

The Cisco IP Phone 7841 is a VoIP desk phone with four programmable line keys for business users who need multiple concurrent calls. A 3.5 inch grayscale display shows caller ID and call history at a glance. Integrated wideband audio works through the handset, the built-in speakerphone or a connected headset. It suits offices deploying Cisco on-premises, hosted or Webex Calling platforms.

Thermals noise and power

Power over Ethernet Class 1 delivers both data and power through a single cable, removing the need for a separate mains adapter. The phone draws minimal power and runs silently with no moving parts, so it adds no audible noise to a quiet workspace. An integrated IEEE 10/100/1000 switch passes network traffic to a downstream PC without extra cabling. Cisco EnergyWise support allows centralised energy monitoring across the deployment.

Build connectors and mounting

Two RJ-45 ports provide uplinks to the network and a passthrough for a computer, reducing desk clutter. The handset cord and optional headset connect via standard modular jacks on the rear. Fixed feature keys for hold, transfer, conference and voicemail give tactile control without menu diving. Wall-mountable design allows vertical installation where desk space is limited. The 7800 series chassis is built for daily commercial use.

Highlights

  • Four programmable line keys give quick access to telephony features
  • 5 inch high-resolution grayscale display provides clear call information
  • Built-in wideband speakerphone enables hands-free communication
  • Power over Ethernet Class 1 reduces energy costs
  • Integrated 10/100/1000 Ethernet switch supports flexible network deployment

Specifications

BrandCisco Systems, Inc
ModelIP Phone 7841
Part NumberCP-7841-K9=
Additional FeaturesIP Phone Technology:
VoIP
Total Number of Phone Lines:
4
Caller ID:
Yes
Speakerphone:
Yes
Features:
Speed Dial
Indicator
Auto-answer
Call Forwarding
Call History
Call Waiting
Do Not Disturb Setting
Music on Hold
Distinctive Ringing
Date and Time
Voice Mail
Multilingual Menu
Multiple Ring Tones
Voice Codec:
G.711a
G.711u
G.722
G.729ab
iLBC
Display & Graphics
Display Color:
Monochrome
Backlight:
Yes
Screen Size:
3.5"
Screen Resolution:
396 x 162
Interfaces/Ports
Network (RJ-45):
Yes
Number of Network (RJ-45) Ports:
2
PoE (RJ-45) Port:
Yes
Management & Protocols
Communication Protocols:
Shipping weight2.27 kg
Package size127 × 127 × 127 mm

Questions about this item

How do I connect the CP-7841-K9= using its two RJ-45 ports and PoE?

Plug the incoming Ethernet cable into the network port marked with a switch symbol; the second RJ-45 port connects a PC. The phone draws Class 1 PoE, so no separate power adapter is needed if the switch supplies it.

Which replaceable parts will the Cisco 7841 need over time?

The coiled handset cord and the handset itself are the main wear items; both unplug and swap without tools. The wideband speakerphone and keypad are fixed and not user-serviceable.

When does the integrated 10/100/1000 Ethernet switch become the bottleneck?

The built-in switch tops out at 1000 Mbps, so sustained gigabit traffic from a PC through the phone will hit that ceiling before the phone's own VoIP stream does.

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