Device Type: Four-Line IP Desk Phone (VoIP)
Brand/Model: Cisco IP Phone 7841 (CP-7841-K9 / CP-7841-K9=)
Video Output: N/A (Audio-only device; no video output)
Data Ports: 2× RJ-45 Ethernet ports (10/100/1000BASE-T integrated switch) for LAN and PC connection; 1× RJ-9 headset jack; supports Class 1 PoE
Display & Audio:
Display: 3.5-inch (8.9 cm) monochrome LCD, 396 × 162 pixel resolution, white backlight
Speakerphone: Yes, full-duplex
Voice Codecs: G.711a/µ, G.722, G.729ab, iLBC (wideband audio support)
Call Features & Protocols:
Lines: 4 lines with programmable feature keys
Fixed Function Keys: Service, Messaging, Directory, Hold/Resume, Transfer, Conference, Headset, Mute
Call Services: Voicemail, Caller ID, Call Waiting, Call Forwarding, Call Transfer, Call Hold, Message Waiting Indicator, Music on Hold, Speed Dial
VoIP Protocols: SIP, SRTP
Security: IEEE 802.1X, TLS
QoS: IEEE 802.1p, IEEE 802.1Q (VLAN)
Power & Physical:
Power: Class 1 PoE (Power over Ethernet); AC power adapter not included
Dimensions (H×W×D): 207 × 206 × 28 mm (approx.)
Weight: Approx. 868 g
Casing Material: PC/ABS textured plastic
Mounting: Table-top or wall-mountable
Compatibility: Cisco Unified Communications Manager 8.5.1 or later, Cisco Hosted Collaboration Solution, Cisco Spark Cloud, third-party hosted call control
Warranty: 1-Year Limited Hardware Warranty
Key Specs: Cisco CP-7841-K9 IP Phone 7841, 4-Line VoIP Phone, 3.5" Monochrome LCD (396×162), Full-Duplex Speakerphone, G.722 Wideband Audio, 2× 10/100/1000 Ethernet Ports, Class 1 PoE, SIP/SRTP, Wall-Mountable, 1-Year Warranty
Usage: Enterprise & Mid-Sized Business Desk Phones, Information Workers, Administrative Staff, Managers, Call Centers, General Office Communications
