Line Keys – 4-line business-class. Speaker Phone – Built-in high-quality microphone and speaker. Ethernet Connectivity – Two 10/100 BASE-T RJ-45 Ethernet ports (IEEE 802.3). Display Type – LCD Display. Headset Support – Support with selected Plantronics headsets with adapter, On-hook default audio configuration, Headset jack: 2.5 mm. Compatible Platforms – SIP and SPCP Protocol with Cisco Unified Communication 500 Series. Contents – Cisco IP Phone, handset, and stand. Handset cord, RJ-45 Ethernet cable, Quick Installation Guide, and CD. Warranty – 1-year limited hardware warranty with return to factory replacement and a 90-day limited software warranty.