Installation Guide
Tools Needed:
- Network cable (Ethernet)
- Power adapter (if not using PoE)
- Handset and cord
- Screwdriver (if mounting)
- Network switch/router
Step-by-Step Installation
- Unpack and Inspect: Remove all components from packaging and verify contents: phone base, handset, handset cord, power adapter, Ethernet cable, and documentation.
- Connect Network Cable: Connect one end of the Ethernet cable to the LAN port on the phone and the other end to your network switch or router.
- Power Connection: Connect the power adapter to the phone's DC port and plug into a power outlet. Alternatively, use Power over Ethernet (PoE) if supported by your network switch.
- Handset Connection: Connect the handset cord to the handset port on the phone and attach the handset.
- Optional Accessories: Connect additional accessories such as headsets or expansion modules if applicable.
- Power On: Press the power button or wait for the phone to boot automatically. The phone will initialize and attempt to obtain an IP address.
- Configuration: Configure SIP account settings either via web interface or auto-provisioning according to your VoIP provider's instructions.
Specifications
| Model Series | SIP-T4 Series |
| Type | IP Business Phone |
| Color | Black / White |
| Display | 4.3-inch 480x272 color LCD |
| Network Interface | Dual 10/100/1000 Mbps Ethernet ports |
| Protocol Support | SIP RFC3261, TLS, SRTP, IPv6 |
| Power Supply | PoE (802.3af) or 12V DC adapter |
| Audio Codecs | G.711, G.722, G.729, G.726, Opus |
| HD Voice | Wideband audio support |
| Dimensions (HxWxD) | 220 x 210 x 60 mm |
| Weight | 1.2 kg |
| Operating Temperature | 0°C to 40°C |
Warranty Information
- Full Warranty: 2 years parts and labor
- Extended Support: Firmware updates for 5 years
- Additional Coverage: Optional extended warranty available
For warranty service, contact Yealink Customer Service at 1-888-883-1038 or visit Yealink.com
Key Features
HD Voice Quality
Advanced acoustic design with wideband audio support delivers crystal-clear voice quality for natural conversations and reduced listening fatigue.
PoE Support
Power over Ethernet capability simplifies installation by delivering both power and data through a single network cable, reducing cable clutter.
Dual Ethernet Ports
Built-in network switch allows daisy-chaining to a computer, eliminating the need for an additional network drop and reducing infrastructure costs.
Advanced SIP Features
Comprehensive SIP protocol support including presence, BLF, call transfer, conferencing, and secure communications with TLS and SRTP.
Intuitive Interface
User-friendly graphical interface with context-sensitive soft keys, customizable XML applications, and easy navigation for enhanced productivity.
Enterprise Security
Multiple security features including secure boot, encrypted configuration files, and advanced authentication mechanisms for enterprise deployments.
Call Management Features
Call Transfer
Blind and attended call transfer capabilities for efficient call handling
Conference Calling
Multi-party conference calls with up to 5 participants
Call Forwarding
Flexible call forwarding options based on time, availability, or number
Call Recording
One-touch call recording with configurable storage options
Busy Lamp Field
Visual status indication of colleagues' availability
Auto Attendant
Integrated auto attendant for basic call routing functionality
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Phone won't power on | Power supply issue, faulty cable | Check power adapter connection, try different power source, verify PoE switch functionality |
| No dial tone | Network issue, SIP configuration error | Check network connectivity, verify SIP account settings, restart phone |
| Poor audio quality | Network congestion, codec mismatch | Check network QoS settings, verify codec configuration, test with different codec |
| Cannot make/receive calls | Registration failure, firewall blocking | Check SIP server registration status, verify firewall ports (5060, 5061, RTP ports) |
| Display issues | Loose connection, firmware problem | Check display cable connection, reboot phone, update firmware |
| Feature buttons not working | Configuration error, hardware issue | Reset to factory defaults, reconfigure, contact support if persistent |
Common Error Messages
- No Service: SIP registration failed - Check network and SIP server settings
- Network Down: Network connectivity issue - Check Ethernet cable and switch port
- Invalid Number: Dialing rules mismatch - Check dial plan configuration
- Provisioning Failed: Auto-provisioning error - Check provisioning server URL and credentials
- Memory Full: Call logs or recordings full - Clear call history or recordings
- Codec Unavailable: Codec negotiation failure - Check codec priority settings
Manual Downloads
Current Model Manuals
SIP-T46S
Advanced Executive Phone
SIP-T43U
Mid-range Business Phone
SIP-T31P
Entry-level IP Phone
SIP-T54W
Wireless DECT Phone
Popular Previous Models
SIP-T48G
Gigabit IP Phone
SIP-T42S
Standard Business Phone
SIP-T29G
Basic IP Phone
SIP-T23P
Economy IP Phone