What Is the Yealink SIP-T31P?
The Yealink SIP-T31P is an entry-level IP desk phone designed for small to medium businesses that want professional VoIP communication without complexity or high cost. It supports two SIP accounts, offers HD voice quality, and comes with built-in Power over Ethernet (PoE) — meaning it powers itself directly through the network cable, no separate power adapter needed.
It pairs perfectly with VoIP systems like 3CX, FreePBX, Asterisk, and virtually any SIP-compatible PBX platform, making it one of the most versatile and widely deployed desk phones in business environments.
Key Features
Power over Ethernet (PoE)
The SIP-T31P powers itself through the Ethernet cable using the 802.3af PoE standard. This eliminates the need for a separate power adapter at each desk — a significant advantage in office deployments where cable management and desk tidiness matter. It also means one less socket occupied at each workstation.
HD Voice with Smart Noise Filtering
Yealink's Optima HD Voice Technology delivers crystal-clear audio on both speaker and handset. The built-in Smart Noise Filtering technology reduces background noise — keyboard clicks, office chatter, air conditioning — so conversations stay focused and professional even in busy environments.
2 SIP Accounts
The T31P supports two simultaneous SIP accounts, allowing a single desk phone to handle two separate lines — for example, a direct number and a shared queue number — without needing a second device.
5-Way Local Conference
Built-in support for local 5-way conference calls allows you to bring multiple parties into a call directly from the phone without a separate conference system or bridge.
Adjustable Multi-Angle Stand
The ergonomic stand supports multiple tilt angles so each user can position the display comfortably on their desk, reducing neck strain during long calls.
132×64 Graphical LCD with Backlight
The backlit display is clear and readable in all lighting conditions, showing caller ID, call duration, time, date, and menu navigation clearly without squinting.
Technical Specifications
| SIP Accounts | 2 lines |
| Display | 2.3" 132×64 graphical LCD with backlight |
| Audio | HD Voice, Smart Noise Filtering, full duplex speakerphone |
| Power | Built-in PoE (802.3af) — no adapter needed |
| Network | Dual-port 10/100 Mbps Ethernet |
| Conference | Local 5-way conference |
| Compatibility | 3CX, FreePBX, Asterisk, BroadSoft, and all SIP platforms |
| Dimensions | 18.9 × 18.8 × 16.2 cm |
| Weight | 700g |
Who Is It Best For?
- Businesses deploying 3CX or any SIP PBX system who need reliable, affordable desk phones
- Office environments with PoE-capable network switches — zero extra cabling or power sockets needed
- Reception desks and shared lines where two simultaneous accounts on one device is an advantage
- Remote workers who want a dedicated desk phone rather than relying on a softphone
- Any business wanting to move from traditional landlines to a modern VoIP setup
Pros & Cons
✅ Pros
- Built-in PoE — no power adapter needed
- Excellent HD audio quality
- Works with every major SIP/VoIP platform
- Very affordable for the quality
- Easy to provision and deploy at scale
- Compact, professional desk design
- 5-way local conferencing built in
❌ Cons
- Monochrome display only (no colour)
- Power adapter sold separately if no PoE switch
- No Gigabit Ethernet (100Mbps only)
- No Wi-Fi — wired only
- No EXP module support on this model
Pairing with 3CX
The Yealink SIP-T31P is one of the officially supported and auto-provisioned phones for 3CX. This means when deployed in a 3CX environment, the phone can be provisioned automatically via the 3CX management portal — no manual configuration of SIP credentials needed. Just plug it in, and 3CX detects and configures it. This makes large-scale deployments fast and error-free.
At 360DigitalU, we deploy the Yealink T31P regularly as part of our 3CX cloud communication implementations. It is our go-to recommendation for businesses wanting an affordable, reliable desk phone that just works.
Our Verdict
The Yealink SIP-T31P is the benchmark for entry-level IP phones. It hits the right balance of price, quality, and features — PoE, HD voice, dual SIP accounts, and broad compatibility make it a safe, smart choice for any VoIP deployment. If you are building or upgrading a business phone system and need reliable, affordable desk phones, the T31P should be at the top of your list.
Check current price and availability on Amazon.
Affiliate disclosure: This is an affiliate link. If you purchase through it, we may earn a commission at no extra cost to you. We only recommend products we genuinely use and believe in.