| Audio Features | HD voice: HD handset, HD speaker |
| Smart Noise Filtering |
| Wideband codec: Opus, G.722 |
| Narrowband codec: G.711(A/μ), G.723.1, G.729 |
| G.729A, G.726, iLBC |
| DTMF: In-band, Out-of-band (RFC 2833) and SIP INFO |
| Full-duplex hands-free speakerphone with AEC |
| VAD, CNG, AEC, PLC, AJB, AGC |
| Phone Features | 2 VoIP accounts |
| Call hold, mute, DND |
| One-touch speed dial, hotline |
| Call forward, call waiting, call transfer |
| Group listening, SMS, emergency call |
| Redial, call return, auto answer |
| Local 5-way conferencing |
| Direct IP call without SIP proxy |
| Ring tone selection/import/delete |
| Set date time manually or automatically |
| Dial plan |
| XML Browser, action URL/URI |
| Integrated screenshots |
| RTCP-XR, VQ-RTCPXR |
| Enhanced DSS Key |
| Directory | Loal phonebook up to 1000 entries |
| Black list |
| XML/LDAP remote phonebook |
| Smart dialing |
| Phonebook search/import/export |
| Call history: dialed/received/missed/forwarded |
| IP-PBX Features | Busy Lamp Field (BLF), Bridged Line Apperance (BLA) |
| Anonymous call, anonymous call rejection |
| Hot-desking, voice mail |
| Flexible seating |
| Call park, call pickup |
| Executive and Assistant |
| Centralized call recording |
| Visual voice mail |
| Call recording |
| Display and Indicator | 2.3" 132x64-pixel graphical LCD with backlight |
| LED for call and message waiting indication |
| Dual-color (red or green) illuminated LEDs for line status information |
| Intuitive user interface with icons and soft keys |
| Multilingual user interface |
| Caller ID with name and number |
| Power saving |
| Feature keys | 2 line keys with LED |
| 6 features keys: transfer, message, headset, redial, mute, hands-free speakerphone |
| 5 navigation keys |
| Volume control keys |
| 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 |
| Other Physical Features | Color: Classic Grey |
| Wall mountable |
| External Yealink AC adapter |
| AC 100~240V input and DC 5V/600mA output |
| 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) |
| Management | Configuration: browser/phone/auto-provision |
| Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy |
| Auto-provision with PnP |
| Zero-sp-touch, TR-069 |
| Phone lock for personal privacy protection |
| Reset to factory, reboot |
| Package tracing export, system log |
| Network and Security | SIP v1 (RFC2543), v2 (RFC3261) |
| Call server redundancy supported |
| NAT traversal: STUN mode |
| Proxy mode and peer-to-peer SIP link mode |
| IP assignment: static/DHCP |
| HTTP/HTTPS web server |
| Time and date synchronization using SNTP |
| UDP/TCP/DNS-SRV (RFC 3263) |
| QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSCP |
| SRTP for voice |
| Transport Layer Security (TLS) |
| HTTPS certificate manager |
| AES encryption for configuration file |
| Digest authentication |
| OpenVPN, IEEE802.1X |
| IPv6 |
| LLDP/CDP/DHCP VLAN |
| ICE |
| Package Features | Package content: |
| - Yealink SIP-T31P IP phone |
| - Handset with handset cord |
| - Ethernet Cable (1.5m CAT5E UTP Cable) |
| - Stand |
| - Quick Start Guide |
| - Power Adapter (Optional) |
| Qty/CTN: 10 PCS |
| N.W/CTN: 9.79 kg |
| G.W/CTN: 10.83 kg |
| Giftbox size: 213 mm*210 mm*103 mm |
| Carton Meas: 535 mm*443 mm*227 mm |
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