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Highlights from (Ciscowebpage)
• 3-line business-class IP phone
• Connects directly to an Internet telephoneservice provider or to an IP private branch exchange (PBX)
• Dual switched Ethernet ports, speakerphone,caller ID, call hold, conferencing, and more
• Easy installation and highly secure remoteprovisioning, as well as menu-based and web-based configuration
• Supports both Session Initiation Protocol (SIP)and Smart Phone Control Protocol (SPCP) with the Cisco®UnifiedCommunications 500 Series
See below link for Cisco Data Sheet: