Il telefono Yealink SIP-T31P supporta 2 linee SIP ed è fornito di porta EHS per utilizzare cuffie senza filo professionali e presa plug RJ9 per cuffie con filo.

HD voice HD handset, HD speaker
Wideband codec Opus, G.722
Narrowband codec G.711(A/μ), G.723.1, G.729AB, G.726, iLBC
DTMF In-band, Out-of-band (RFC 2833) and SIP INFO
Display 2.3” 132x64-pixel graphical LCD with backlight
Interface • 2 x RJ45 10/100M Ethernet ports • Power over Ethernet (IEEE 802.3af), class 2 • 1 x RJ9 (4P4C) handset port • 1 x RJ9 (4P4C) headset port
Color Classic Grey
Wall mountable Yes
Power consumption (PSU) 2-3W
Power consumption (PoE) 3-4W
Dimension (W*D*H*T) 188mm*189mm*162mm*50mm
Operating humidity 10~95%
Operating temperature -10~50°C (+14~122°F)