Type:VoIP Type:IP SIP Handset Headset:RJ9 Network Interfaces:2*100Mbps Keypad:31 keys(including 1 Hands-free key) HD Hands-free Speaker:0~7KHz HD Hands-free Micro0~7KHz Supported Language:English, French, Italy, Japanese, Russian, Portuguese etc. Installation:Desktop wall-mount Certificate:CE, FCC, ISO9001,