Audio
Voice codecs	AEC, AGC, AJB, G.711, G.711a, G.722, G.723.1, G.726, G.729, G.729A, G.729B, G.729ab, VAD, iLBC
Speakerphone
Microphone mute
Comfort noise generation (CNG)
Packet loss concealment (PLC)
Design
Product type	IP Phone
Handset type	Wired handset
Product colour	Grey
Wall mountable
Display
Display	LCD
Display diagonal	5.84 cm (2.3")
Display resolution	132 x 64 pixels
Display number of lines	2 lines
Backlight display
Management features
Keypad number of keys	11
Integrated voicemail
Voicemail indication
Network
Ethernet LAN interface type	Fast Ethernet
Ethernet LAN data rates	10,100 Mbit/s
Wi-Fi standards	802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)
Security algorithms	AES, WPA2, WPA3
Ethernet LAN
Wi-Fi
Bluetooth
Operational conditions
Operating temperature (T-T)	-10 - 45 °C
Operating relative humidity (H-H)	10 - 95%
Storage temperature (T-T)	-30 - 70 °C
Packaging content
Number of handles included	1 pc(s)
Phone features
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Answering machine
Call waiting
Speed dialling
Call hold
Call forwarding
Redialing
Caller ID
Do not disturb function
Call park
Call pick up
Anonymous call
Anonymous call rejection
Full duplex
Short Message Service (SMS)
Call return
Call transfer
Emergency call
Ports & interfaces
Ethernet LAN (RJ-45) ports	2
RJ-9 ports quantity	2
Power
AC adapter input voltage	100 - 240 V
Power consumption (typical)	1.7 W
Power consumption (Power over Ethernet (PoE))	2.6 W
Power over Ethernet (PoE)
Weight & dimensions
Width	188 mm
Depth	189 mm
Height	162 mm

T31W: •• Built-in dual band 2.4G/5G Wi-Fi (802.11a/ b/g/n/ac) • Yealink HD Voice • 2.3” 132x64-pixel graphical LCD with backlight • Two-port 10/100M Ethernet Switch • PoE support • Up to 2 SIP accounts • Local 5-way conferencing • Support EHS Wireless Headset • Unified Firmware • Support YDMP/YMCS • Stand with 2 adjustable angles • Wall mountable • Handset with hall switch