Cisco IP Phone 7841 VoIP Phone SIP 4 Lines CP-7841-K9

Cisco CP-7841-K9 is a 4-line SIP-enabled business IP phone from the Cisco IP Phone 7800 Series. With a high-resolution backlit greyscale display, full-duplex speakerphone, integrated Gigabit Ethernet switch, and wideband audio support, it is designed for administrative staff, managers or users needing moderate call-traffic handling in on-premises or hosted IP telephony environments.

Product Features

Four Programmable Line and Feature Keys

The CP-7841 supports up to four programmable line/feature keys, letting users monitor and manage multiple line appearances or call-features from one device.

High-Resolution Back-lit Display

Equipped with a 3.5″ (396 × 162 pixel) monochrome greyscale backlit display, ensuring clear visibility of call information, directory names, and soft-key options.

Integrated Gigabit Ethernet Switch

Includes dual 10/100/1000 Mbps ports (one for network, one for PC pass-through) to simplify wiring and reduce desktop clutter.

Wideband Audio & Full-Duplex Speakerphone

Supports wideband codec (G.722) and provides hands-free full-duplex speakerphone and headset connectivity — improving clarity and flexibility of voice communication.

SIP and Broad Platform Compatibility

Intended for deployment with on-premises call control (e.g., Cisco Unified Communications Manager) and hosted-/SaaS-based SIP platforms with support for encrypted signaling (TLS) and media (SRTP).

Product Specifications

• Screen: 396 × 162 pixels (3.5″)
• Ethernet: Dual 10/100/1000 Mbps ports
• Programmable line keys: 4
• PoE Class: Class 1 (IEEE 802.3af)
• Voice codecs: G.711 (a/µ), G.722 (wideband), G.722.2, G.729ab, iLBC, OPUS
• Display type: Backlit greyscale monochrome
• Headset support: RJ-9 analog headset jack (wideband capable)
• Wall-mountable: Yes (optional wall-mount kit)
• Compatibility: SIP, wide enterprise calling features (call-hold, transfer, conference, directory, voicemail, speed-dial)