ПОДРОБНО ОПИСАНИЕ:
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps10499/data_sheet_c78-548558.html
Full-featured 8-line business-class IP phone supporting Power over Ethernet (PoE)
Connects directly to an Internet telephone service provider or to an IP private branch exchange (PBX)
Easy installation and highly secure remote provisioning, as well as menu-based and web-based configuration
Wideband audio for unsurpassed voice clarity and enhanced speaker quality
Paper label insert for buttons to indicate speed dials, shared lines, or extensions
Supports up to two CiscoR SPA500S Expansion Module, adding an additional 64 buttons
Supports both Session Initiation Protocol (SIP) and Smart Phone Control Protocol (SPCP) with the Cisco Unified Communications 500 Series for Small Business