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Phone Guides

Fanvil X4U

Specifications

Calling

SIP accounts / lines
12
Programmable keys
30
Local conference participants
6

Display

Display size
2.8 in
Display resolution
320 x 240
Colour display
Yes

Connectivity

Ethernet
Gigabit
Power over Ethernet
Yes
Wi-Fi
Optional adapter
Bluetooth
Optional adapter
USB ports
1

Audio

HD voice
Yes

Security

TLS signalling
Yes
SRTP media encryption
Yes

Compatible phone systems

The indicator shows whether a compatible configuration path is documented, or whether the result still needs verification. A not-listed result does not mean technically incompatible. It does not replace checking the provider firmware branch, tenant, network and feature requirements.

3CX V20Not reviewed

Listed firmware applies to 3CX V20. Cloud or remote phones need a router phone or SBC. Recheck the current provider release before deployment.

Zoom PhoneNot reviewed

Yealink phones require Zoom-specific firmware. A certification entry does not confirm every feature or regional deployment.

Microsoft Teams SIP GatewayNot reviewed

This is SIP Gateway compatibility, not native Teams-phone certification. Use the gateway provisioning path and approved firmware; confirm tenant licensing, policies and network requirements.

Sources

Source notes

  • Specifications follow the currently linked datasheet. Earlier hardware or firmware revisions may differ.
  • Assignable DSS positions; this count can include multiple pages of keys.
  • Display size and resolution describe the main screen; this model also has separate DSS displays.