What is the display size of the Cisco 9871 IP Phone?

The Cisco 9871 IP Phone has a 5-inch LCD display.

What technology does the Cisco 9871 IP Phone use for audio communication?

The Cisco 9871 IP Phone uses VoIP technology to transfer audio signals over the Internet.

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Main image of Cisco 9871 IP Phone - Corded - Corded/Cordless - Bluetooth, Wi-Fi - Carbon Black - VoIP - 5" LCD - IEEE 802.11a/b/g/n/ac - 2x Network (RJ-45) - PoE Ports DP-9871-K9=

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Cisco 9871 IP Phone - Corded - Corded/Cordless - Bluetooth, Wi-Fi - Carbon Black - VoIP - 5" LCD - IEEE 802.11a/b/g/n/ac - 2x Network (RJ-45) - PoE Ports DP-9871-K9=

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Enjoy the internet to its max and get cost-effective voice communication to areas like lobbies, guest rooms, and conference halls
Uses VoIP technology to transfer audio signals over the Internet while circumventing high toll charges by telephone companies
Electrical power and data are transmitted using a single cable to devices such as Access Points, IP cameras or IP phones

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Cisco DP-9871 IP Phone - Corded - Corded/Cordless - Bluetooth, Wi-Fi - Desktop, Wall Mountable - Carbon Black

VoIP - 5" LCD - IEEE 802.11a/b/g/n/ac - 2 x Network (RJ-45) - PoE Ports

General
Brand	Cisco

Model
Part Number	DP-9871-K9=

Additional Features
Additional Features	Ethernet Switch: An internal 2-port Cisco Ethernet switch allows for a direct connection to a 10/100/1000BASE- T Ethernet network (IEEE 802.3i/802.3u/802.3ab) through an RJ-45 interface with single LAN connectivity for both the phone and a co-located PC.An internal 2-port Cisco Ethernet switch allows for a direct connection to a 10/100/1000BASE- T Ethernet network (IEEE 802.3i/802.3u/802.3ab) through an RJ-45 interface with single LAN connectivity for both the phone and a co-located PC.
Specification	Maximum of supported line and programmable line keys: 128 Maximum of supported SIP lines: 130 for CUCM and Webex DI 16 for Webex Calling and Open SIP platforms Hard keys: Action button Favorite button Hold/Resume key Transfer key Conference key Application key Directory key Standard keypad Volume-control toggle key Speakerphone, Headset, and Mute keys Home button USB and Auxiliary Ports: One USB-A port: The USB-A port provides 0.5A power output at 5V or 2.5W under PoE, and 1.3A power output at 5V or 6.5W when using the Cisco Power Adapter 3 (local power supply). One USB-C port: The USB-C port provides 0.5A power output at 5V or 2.5W under POE or when using the Cisco Power Adapter 3 (local power supply).

Audio
Speakerphone	The full-duplex speakerphone provides flexibility in placing and receiving calls handsfree. For added security, the audible Dual Tone Multifrequency (DTMF) tones are masked when the speakerphone mode is used.

Display
Display	5-inch Color Touch LCD, 1280 x 720 resolution, backlit

Power
Power	IEEE Power over Ethernet class 3 Input rating: 0.42A, 48V DC

Spec
Dimensions	8.9 x 8.4 x 1.9 in. (226.0 x 214.0 x 49.4 mm)
Weight	1055g

Additional Information
First Listed on Newegg	January 16, 2026

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: Non-refundable
Return for replacement within: 30 days
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Manufacturer Contact Info

Manufacturer Website
Support Phone: 1-800-553-6387
Support Website
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Item#: 179-005Y-002B5