Device Type: Two-Line IP Desk Phone (VoIP)
Brand/Model: Cisco IP Phone 7821 (CP-7821-K9 / CP-7821-K9=)
Video Output: N/A (Audio-only device; no video output)
Data Ports: 2× RJ-45 Ethernet ports (10/100BASE-T integrated switch) for LAN and PC connection; supports Class 1 PoE
Display & Audio:
Display: 3.5-inch monochrome LCD, 396 × 162 pixel resolution, white backlight
Speakerphone: Yes, full-duplex
Voice Codecs: G.711a/µ, G.722, G.729a, iLBC (wideband audio support)
Hearing Aid Compatible: Yes (HAC)
Call Features & Protocols:
Lines: 2 lines (available in charcoal and white)
Fixed Function Keys: Service, Messaging, Directory, Hold/Resume, Transfer, Conference
Programmable Line Keys: Yes
Call Services: Voicemail, Caller ID, Call Waiting, Call Forwarding, Call Transfer, Call Hold, Message Waiting Indicator
VoIP Protocols: SIP, SRTP
Security: 128-bit AES, 256-bit AES, IEEE 802.1X, TLS
QoS: IEEE 802.1p, IEEE 802.1Q (VLAN)
Power & Physical:
Power: Class 1 PoE (Power over Ethernet); does not include a power adapter
Casing Material: Polycarbonate ABS textured plastic (PC/ABS)
Mounting: Table-top or wall-mountable
Weight: Approx. 0.867 kg
Compatibility: Cisco Unified Communications Manager, Cisco Hosted Collaboration Solution, Cisco Unified Survivable Remote Site Telephony
Key Specs: Cisco CP-7821-K9 IP Phone 7821, 2-Line VoIP Phone, 3.5" Monochrome LCD (396×162), Full-Duplex Speakerphone, G.722 Wideband Audio, 2× 10/100 Ethernet Ports, Class 1 PoE, SIP/SRTP, Wall-Mountable, 1-Year Warranty
Usage: Enterprise & Mid-Sized Business Desk Phones, Information Workers, Teleworkers with Light-to-Moderate Voice Needs, Call Centers, General Office Communications
