Yealink W80B, 1,8 - 1,9 GHz, 300 m, SNTP/NTP, VLAN, SIP v1, SIP v2, UDP/TCP/TLS, DHCP, HTTPS,SHA-256,SRTP,SSL/TLS, AJB,CNG,G.726,G.729,PLC,VAD,iLBC, Yealink W53H/W56H