The Cisco SPA508G phone is ready to support your important business calls with eight line appearances and high-quality wideband audio. This VoIP phone includes SIP and SPCP interoperability for easily installing onto your existing open source or Cisco phone system. This Cisco SPA500 series phone supports a wide range of call features and functions. Set up the Cisco SPA508G with casual phone users or power users. The user-friendly interface and backlit display lets less-frequent users easily access the phone's features. This phone is also expandable, allowing users like receptionists and secretaries to view more telephony options. Note: does not include AC adapter.