Poly VVX 411 IP Phone - Corded - Desktop - Black - 12 x Total Line - VoIP - Speakerphone - 2 x Network (RJ-45) - PoE Ports - LDAP, SIP, DHCP, SNTP, RTCP, RTP, TCP, UDP, SRTP, SDP Protocol(s)

Enjoy superior voice communications while retaining the convenience and user-friendliness over Internet Uses VoIP technology to transfer audio signals over the Internet while circumventing high toll charges by telephone companies