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NOTE: This product is no longer being sold and might not be supported.

View the End-of-Life Notice to learn: 

  • End-of-sale and end-of-life dates
  • What replacement products are available
  • Information about product support

Flexible, Reliable, Secure Communications

The Cisco Unified IP Phone 521SG is a single-line IP phone with two call line appearances and one-touch access to redial, transfer, conference, and hold or resume. A 10/100 PC switch port enables LAN connectivity to a colocated PC that helps you reduce additional phone wiring costs. The phone can also be powered by a network switch with Power over Ethernet (PoE) capability or use an optional power adapter. Designation of separate 802.1q VLANs for PC and phone provides security and reliability of voice and data traffic.

Flexible to suit the needs of small to medium-sized businesses, the Cisco Unified IP Phone 521SG:

  • Easily fills the need for basic phone services anywhere in your work environment, from lobby to manufacturing floor
  • Is easy to configure and physically relocate on the network
  • Four dynamic soft keys that guide you through core business functions
  • Has a backlit pixel-based display putting intuitive features, calling information, and device system information at your fingertips
  • Accessibility features for users with special needs

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