Yealink SIP-T46U IP Phone - Corded - Corded - Wall Mountable - Classic Gray - VoIP - Caller ID - Speakerphone - 2 x Network (RJ-45) - USB - PoE Ports - Color - SIP, SIP v2, STUN, NAT, DHCP, SNTP, UDP, TCP, TLS, IPv6, LLDP, ... Protocol(s):