Sound and Hear with Remarkable Clarity
Yealink Optima HD Voice technology combines cutting-edge hardware and software with wideband technology for maximum acoustic performance.
Efficient Deployment and Management
Yealink T4U series supports effortless mass deployment and Zero Touch Provisioning with Yealink’s Redirection and Provisioning Service (RPS) and Boot mechanism, making the device management labor-saving and efficient for the administrators.
Dual USB Ports for Flexible Expansion Choices
Bluetooth/Wi-Fi/Wireless Headset Dongles
With the optional USB dongles, the T42U can be enabled of the features including Bluetooth and Wi-Fi or connecting to a compatible wireless headset.
Specifications
| Product type | IP Phone |
| Handset type | Wired handset |
| Product colour | Grey |
| Device lock | Y |
| Wall mountable | Y |
| Mounting | Desk/Wall |
| Distinctive ring | Y |
| Speed dialling | Y |
| Call hold | Y |
| Call forwarding | Y |
| Conference call | Y |
| Redialing | Y |
| Caller ID | Y |
| Phonebook capacity | 100 entries |
| Direct call | Y |
| Number of VoIP accounts | 12 |
| Call transfer | Y |
| Call history | Y |
| Integrated voicemail | N |
| Number of programmable keys | 6 |
| Number of function keys | 5 |
| Display | LCD |
| Display diagonal | 6.86 cm (2.7") |
| Display resolution | 192 x 68 pixels |
| Microphone mute | Y |
| Ethernet LAN | Y |
| Wi-Fi | Y |
| Bluetooth | Y |
| Security algorithms | HTTPS |
| USB 2.0 ports quantity | 2 |
| Ethernet LAN (RJ-45) ports | 2 |
| RJ-9 ports quantity | 2 |
| AC adapter input voltage | 100 - 240 V |
| Input frequency | 50/60 Hz |
| AC adapter output voltage | 5 V |
| AC adapter output current | 1.2 A |
| Power consumption (typical) | 2.2 W |
| Operating temperature (T-T) | -10 - 50 °C |
| Operating relative humidity (H-H) | 10 - 95% |
| Width | 212 mm |
| Depth | 189 mm |
| Height | 175 mm |
| Package width | 627 mm |
| Package depth | 256 mm |
| Package height | 235 mm |
| Package weight | 6.3 g |
