| Model | Yealink SIP-T31G |
| Display | 2.3” graphical LCD with backlight, 132 x 64 pixels |
| Lines | 2 VoIP accounts |
| Audio | HD voice (HD handset and HD speaker) |
| Codec Support | Wideband codec: Opus, G.722; Narrowband codecs: G.711(A/μ), G.723.1, G.729AB, G.726, iLBC |
| Phone Features | Call hold, mute, DND, transfer, message, headset, redial, mute, hands-free speakerphone |
| Conference Call | Local 5-way conferencing |
| Navigation Keys | 5 keys (up, down, left, right, OK) |
| Feature Keys | 6 keys (transfer, message, headset, redial, mute, speakerphone) |
| Ethernet Ports | Dual-port Gigabit Ethernet |
| Power Over Ethernet (PoE) | Supported |
| Phonebook | Local phonebook up to 1000 entries, blacklist, XML/LDAP remote phonebook |
| Network Features | DHCP, PPPoE, VLAN, SRTP, HTTPS, 802.1X, L2TP, OpenVPN, IPv6 support |
| Security | TLS 1.3, AES encryption, secure boot |
| Display Support | Ring tone selection, date/time sync (manual, automatic) |
| Stand | Adjustable multi-angle stand |
| Additional Features | EHS headset support, unified firmware, USB headset support |
| Dimensions (WxDxH) | 185 mm x 188 mm x 160 mm |
| Weight | Approx. 0.9 kg |
