Key Features

High-clarity display: 2.5-inch (240 x 120 pixel) grayscale backlit screen for clear visibility

Flexible connectivity: Two 10/100BASE-T Ethernet ports (LAN + downstream device such as PC)

Power options: Supports IEEE 802.3af Class 2 PoE or optional AC-to-DC power supply

Audio quality: Narrowband audio handset and wideband-capable RJ-9 headset port

User experience: Backlit line buttons, message waiting indicator, volume control, and standard navigation keys

Scalability: Supports up to 2 SIP lines (registrations)

Mounting options: Desktop stand or wall-mount with standard screws/anchors

Network support: Compatible with Cat 3, 5, 5e, and 6 Ethernet cabling

Advanced Capabilities

Protocols: Session Initiation Protocol (SIP) with multiplatform call control

Language support: Wide range including English, Arabic, French, German, Russian, Chinese, Japanese, Turkish, and more

QoS support: Cisco Discovery Protocol and IEEE 802.1Q/p standards for optimized voice traffic

Security features:

802.1X authentication

TLS signaling encryption with AES-128/256

SRTP media encryption with AES-128/256

Encrypted configuration and file authentication

Factory-installed certificates

Guest & user customization: Adjustable ringtones, VLAN ID overrides, and admin configuration

Technical Specifications

Display: 2.5″ grayscale backlit (240 x 120 px)

Ethernet switch: Dual RJ-45 ports (10/100BASE-T)

Power consumption: ≤ 6.49W (PoE Class 2)

Dimensions (HxWxD): 207 x 171 x 37.5 mm (without stand)

Weight: 456 g (without stand/handset), 512 g (with stand)

Casing: ABS polycarbonate plastic

Operating temperature: 0° to 40°C

Storage temperature: -10° to 60°C

Humidity: Operating 10–90% (non-condensing), Non-operating 10–95%

Compliance: CE, UL, FCC Part 15 Class B, IEEE 802.3af, EN55032/EN55024, CISPR32, VCCI Class B

The Cisco 6821 IP Phone delivers affordable, reliable, and secure VoIP communications—perfect for businesses in the UAE upgrading to modern IP telephony.