Cisco IP Phone 7821 - Cost-Effective 2-Line VoIP Phone with Wideband Audio and PoE Class 1 Support

Enhance voice collaboration for small to large businesses with the Cisco IP Phone 7821, a technically advanced VoIP solution tailored for information workers and managers with occasional-to-light communication needs. This device features two programmable line keys, a high-resolution 396 x 162 pixel grayscale display (3.5 inches/89mm), and a full-duplex wideband audio speakerphone supporting G.722 codec for superior clarity. Powered by PoE Class 1 (IEEE 802.3af) with an integrated 10/100 Ethernet switch, it reduces energy and installation costs while supporting Cisco EnergyWise for optimized power usage. Compatible with Cisco on-premises, hosted, Webex Calling, and third-party call control (via Cisco Expressway for VPN-free remote access), it runs on the Cisco Webex Phone OS for unified administration with the 7800 and 8800 Series. Additional features include SIP and SRTP protocol support, LDAP directory integration, and 802.1Q/p Quality of Service (QoS), ensuring secure and efficient communication. With a replaceable silver bezel and adjustable stand, it’s designed for desk or wall-mount deployment, 

Features

• Lines & Display: Two programmable line keys with a 396 x 162 pixel (3.5-inch/89mm) grayscale LCD, backlit for enhanced visibility in low-light conditions.
• Audio Performance: Full-duplex speakerphone with wideband audio (G.722 codec, 50-7000 Hz frequency range), supporting handset and RJ9 headset ports with echo cancellation (G.165/G.168, up to 64ms tail length).
• Connectivity: Dual-port 10/100BASE-T Ethernet switch with auto-negotiation and auto-MDI/MDI-X, compliant with PoE Class 1 (max 3.84W power draw).
• Protocol Support: SIP v2 (RFC 3261-3264), SRTP for encrypted calling, and 802.1X authentication for network security.
• Deployment Flexibility: Compatible with Cisco Unified Communications Manager (CUCM) 8.5.1+, Webex Calling, and third-party platforms; supports Cisco Expressway for remote single sign-on.
• Administration: Cisco Webex Phone OS with HTTPS/TFTP provisioning, syslog debugging, and XML-based application support for customization.
• QoS & Security: 802.1Q/p VLAN tagging and prioritization, DiffServ (RFC 2475), and file encryption for data integrity.
• Design: Adjustable two-position footstand (30°/45° angles), optional wall-mount kit, and replaceable silver bezel for aesthetic customization.

Specifications

• Display: 396 x 162 pixel grayscale LCD, 3.5 inches (89mm) diagonal, backlit with white illumination.
• Ethernet: Dual 10/100BASE-T ports, IEEE 802.3af PoE Class 1, auto-negotiation, auto-MDI/MDI-X.
• Power: PoE Class 1 (3.84W max), optional external power adapter (48V DC, 0.1A, not included).
• Audio Codecs: G.711 (A-law/μ-law), G.722 (wideband), G.729A, with dynamic jitter buffer (30-150ms adjustable).
• Protocols: SIP v2, SRTP, RTP/RTCP (RFC 1889/1890), DHCP (RFC 2131), SNMP (v2c/v3), SNTP (RFC 2030).
• Security: 802.1X EAP-TLS authentication, AES-128 encryption for configuration files.
• Dimensions: 207 x 206 x 33mm (W x H x D, without stand); 8.5 x 8 x 1.5 inches (stand extended).
• Weight: 868g (1.91 lbs) with handset and stand.
• Environmental: Operating temperature 0°C to 40°C, storage -10°C to 60°C, 10%-90% non-condensing humidity.
• Certifications: FCC Part 15 Class B, CE Mark, UL 60950-1, IEEE 802.3 (Ethernet), TIA 810/920.

Highlights

• SEO-Optimized: Keywords like "Cisco IP Phone 7821," "VoIP wideband audio," and "PoE Class 1 business phone" improve search ranking.
• Enhanced Collaboration: Dual-line support with G.722 wideband audio ensures crystal-clear calls.
• Cost Efficiency: PoE Class 1 and integrated switch minimize power and cabling costs.
• Secure Deployment: SRTP and 802.1X provide government-grade security for sensitive communications.
• Scalable Solution: Ideal for small to large businesses with flexible CUCM and Webex integration.

This Cisco IP Phone 7821 offers a technically robust VoIP platform, delivering secure, high-quality voice communication with advanced administrative and deployment capabilities.