Call management Number of parallel conferences 3 Conference call Yes Anonymous call Yes Anonymous call rejection Yes Call waiting Yes Call forwarding Yes Call transfer Yes Call hold Yes Do not disturb function Yes Design Product colour White Wall mountable Yes Operational conditions Operating temperature (T-T) -10 - 50 °C Storage temperature (T-T) -30 - 70 °C Operating relative humidity (H-H) 10 - 95% Performance Number of handsets supported (max) 20 Frequency range 1.88 - 1.9 GHz Maximum range 300 m Number of VoIP accounts 20 Supported network protocols SNTP/NTP, VLAN, SIP v1, SIP v2, UDP/TCP/TLS, DHCP Security algorithms HTTPS, SHA-256, SHA-384, SHA-512, SRTP, TLS Voice codecs AJB, CNG, G.726, G.729, PLC, VAD, iLBC Compatible products Yealink W56H, W57R, W59R, W71H, W73H, W74H, W78H Voice activity detection Yes Comfort noise generation (CNG) Yes Automatic gain control Yes Ports & interfaces Ethernet LAN (RJ-45) ports 1 Ethernet LAN Yes Power Input voltage 100 - 240 V Power over Ethernet (PoE) Yes Weight & dimensions Dimensions (WxDxH) 130 x 100 x 25.1 mm Package width 174 mm Package depth 180 mm Package height 63 mm