| Product type | IP Phone |
| Product colour | Grey |
| Handset type | Wireless handset |
| Device lock | Yes |
| Wall mountable | Yes |
| Mounting | Desk/Wall |
| Caller ID | Yes |
| Phonebook capacity | 1000 entries |
| Number of VoIP accounts | 12 |
| Call waiting | Yes |
| Distinctive ring | Yes |
| Speed dialling | Yes |
| Call hold | Yes |
| Call forwarding | Yes |
| Conference call | Yes |
| Redialing | Yes |
| Do not disturb function | Yes |
| Call park | Yes |
| Call pick up | Yes |
| Anonymous call | Yes |
| Anonymous call rejection | Yes |
| Full duplex | Yes |
| Direct call | Yes |
| Call transfer | Yes |
| Call history | Yes |
| Integrated voicemail | No |
| 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 |
| Rear camera | Yes |
| Ethernet LAN | Yes |
| Wi-Fi | Yes |
| Bluetooth | Yes |
| Ethernet LAN interface type | Gigabit Ethernet |
| Supported network protocols | IPv4/IPv6, SIP v1 (RFC2543), v2 (RFC3261), UDP/TCP/DNS-SRV (RFC 3263) |
| Quality of Service (QoS) support | Yes |
| Security algorithms | 256-bit AES, HTTPS, TLS, WPA2, WPA3 |
| Networking standards | IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.1x, IEEE 802.3af |
| 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 | 63 kg |
| Number of handles included | 1 pc(s) |
| Description |
| Yealink SIP T42U. Product type: IP Phone, Product colour: Grey, Handset type: Wireless handset. Phonebook capacity: 1000 entries. Display: LCD, Display diagonal: 6.86 cm (2.7"), Display resolution: 192 x 68 pixels. Ethernet LAN interface type: Gigabit Ethernet, Supported network protocols: IPv4/IPv6, SIP v1 (RFC2543), v2 (RFC3261), UDP/TCP/DNS-SRV (RFC 3263), Security algorithms: 256-bit AES, HTTPS, TLS, WPA2, WPA3. AC adapter input voltage: 100 - 240 V, Input frequency: 50/60 Hz, AC adapter output voltage: 5 V |
