Yealink SIP-T43U IP Phone - Corded - Corded - Wall Mountable - Classic Gray - 12 x Total Line - VoIP - Caller ID - Speakerphone - 2 x Network (RJ-45) - USB - PoE Ports - SIP, SIP v2, DHCP, SNTP, UDP, TCP, TLS, IPv6, LLDP, CDP, ICE Protocol(s):