Grandstream IP Phone - Corded - Corded/Cordless - Wi-Fi, Bluetooth - Desktop - 4 x Total Line - VoIP - IEEE 802.11a/b/g/n/ac - Speakerphone - 2 x Network (RJ-45) - PoE Ports - Color - SIP, TCP, UDP, RTP, RTCP, ARP, ICMP, DHCP, PPPoE, NTP, STUN, ... Protocol(s):