The Fanvil X4U is a desk phone with a 2.8-inch main screen and a second 2.4-inch screen for DSS keys, plus 12 SIP lines, dual gigabit ports and built-in PoE. It suits sales staff and supervisors who track several lines and extensions at once.
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The Fanvil X4U is a dual-screen business desk phone from the Fanvil XU Series. A 2.8-inch color main display handles calls and menus, while a second 2.4-inch color screen labels the DSS keys. With 12 SIP lines, two gigabit ports and built-in PoE, it fits staff who juggle several lines and colleagues' extensions all day: sales desks, team supervisors and purchasing offices.
Fanvil X4U key specs
Caller details and line status show on the 320×240 main screen, and colleague names sit on the side screen, so nobody has to dig through menus.
- 12 SIP lines and 3 LED line keys.
- 6 DSS keys next to the second screen, up to 30 across 5 pages.
- Two 10/100/1000 Mbps ports: one to the network, one to the PC.
- Integrated PoE, or an optional 5V/2A power supply sold separately.
- 6-way audio conferencing.
A dedicated DSS screen
DSS keys are one-touch shortcuts. Assign each key to a colleague's extension, an outside number or a function such as transfer or pickup. If your PBX supports BLF, the key LED shows whether that extension is busy before you dial. On the X4U the key names appear on a color screen instead of paper labels, so when someone changes desk you just rename the key from the web portal.
HD audio and gigabit ports
G.722 and Opus wideband codecs, full-duplex echo cancellation and noise reduction keep voices clear on the handset and on speakerphone. Both Ethernet ports run at gigabit speed, so a PC connected through the phone keeps full network speed for large files, ERP systems and video calls.
Add-ons through USB
The X4U has no built-in Bluetooth or Wi-Fi. Its USB 2.0 port takes the BT20 Bluetooth dongle or the WF20 Wi-Fi dongle, and it also records calls to a flash drive. Wireless headsets from Plantronics (APD-80 cable) and Jabra (EHS20 cable) are supported through the EHS headset port.
Where the X4U fits in Saudi offices
- Sales and customer service teams that need several SIP accounts on one phone.
- Small branch receptions tracking the manager's and departments' extensions.
- Warehouses and logistics offices in Riyadh and Dammam where calls move between admin and the floor.
- Companies running gigabit networks that do not want the phone to slow the PC down.
PBX compatibility and security
The X4U uses SIP 2.0 over UDP, TCP and TLS, so it registers to standard SIP IP PBXs. Auto provisioning over HTTP/HTTPS, DHCP Option 66 or TR-069 cuts setup time when you roll out dozens of handsets. SRTP and TLS encrypt calls, and 802.1x plus VLAN keep voice traffic separate from data.
Fanvil X4U or X5U?
Both share the same body, dimensions and 30 DSS keys. The X5U adds a larger 3.5-inch main screen, 16 SIP lines instead of 12, 4 line keys instead of 3, built-in Bluetooth 4.2 instead of a dongle, and a 2,000-entry phonebook instead of 1,000. If the user does not need Bluetooth or more than 12 accounts, the X4U does the job.
Frequently Asked Questions
Does the Fanvil X4U need a power adapter?
Not with a PoE switch; it draws power over the network cable. The 5V/2A adapter is optional and not in the box.
Does the X4U have Bluetooth or Wi-Fi?
Neither is built in. Add Bluetooth with the BT20 dongle and Wi-Fi with the WF20 dongle through the USB port.
How many SIP accounts does the X4U support?
12 SIP lines, with 3 line keys and 30 DSS keys across 5 pages.
Specifications
- Model: X4U
- Series: Fanvil XU Series
- Main display: 2.8-inch color LCD, 320×240
- DSS display: 2.4-inch color LCD, 240×320
- SIP lines: 12
- Line keys: 3 with LED
- DSS keys: 6 LED keys, up to 30 across 5 pages
- Keypad: 41 keys: 3 line, 4 soft, 6 function, 4 navigation, OK, 12 digit, 3 volume/mute, 6 DSS, page switch, hands-free
- Bluetooth: Via BT20 USB dongle (not built in)
- Wi-Fi: Via WF20 USB dongle (not built in)
- Protocols: SIP 2.0 over UDP/TCP/TLS, RTP/RTCP/SRTP, STUN, DHCP, IPv6, LLDP, CDP, PPPoE, 802.1x, L2TP, OpenVPN, SNTP, FTP/TFTP, HTTP/HTTPS, TR-069
- Encryption: AES128 and AES256
- Narrowband codecs: G.711a/u, G.729A/B, iLBC
- Wideband codecs: G.722, Opus
- Audio: HD voice on handset and hands-free (0-7 kHz), HAC handset, 16 kHz wideband ADC/DAC
- Audio processing: Full-duplex AEC, VAD, CNG, BNE, NR, AGC, PLC, dynamic adaptive jitter buffer, VQM voice quality monitoring
- DTMF: In-band, RFC2833, SIP INFO
- Ethernet: 2× RJ45 10/100/1000 Mbps (network + bridged PC port)
- Network: IPv4 / IPv6 / dual stack, static IP, DHCP or PPPoE, VLAN, QoS, LLDP, CDP, 802.1x, VPN (L2TP, OpenVPN), RTCP-XR, VQ-RTCP-XR
- Other ports: RJ9 handset, RJ9 headset, USB 2.0 Standard-A, DC input (Φ5.5×2.1×10 mm)
- PoE: Integrated
- Power input: DC 5V / 2A, external power supply optional
- EHS headsets: Plantronics via APD-80 cable, Jabra via Fanvil EHS20 cable
- Phonebook: Local 1000 entries, remote XML/LDAP 1000 entries
- Call log: 1,000 (in, out, missed)
- Phone features: Block/allow list, screen saver, VMWI, programmable DSS/soft keys, network time sync, Action URL / Active URI, uaCSTA, call recording to USB flash drive or server
- Call features: Hold, mute, call waiting, attended/unattended transfer, call forward (always/busy/no answer), intercom, speed dial, anonymous call, redial, DND, auto-answer, park/pickup and voicemail (server dependent), hot line, hot desking, 6-way conference
- Management: Auto provisioning via FTP/TFTP/HTTP/HTTPS/DHCP Option 66/SIP PnP/TR-069, web portal, web packet dump, config and phonebook import/export, firmware upgrade, syslog
- Status LED: 1 (red)
- Safety keyhole: 1
- Mounting: Desk stand with 2 angles (45° and 50°) or wall mount (wall bracket sold separately)
- Color: Black
- Operating temperature: 0 to 45°C
- Operating humidity: 10% to 95%
- Dimensions, desk 45°: 214 × 188.6 × 181.1 mm
- Dimensions, desk 50°: 214 × 180.5 × 190.1 mm
- Dimensions, wall: 214 × 119.4 × 219.1 mm
- In the box: Phone, HD handset, RJ9 handset cord, 1.5 m CAT5E Ethernet cable, back stand (no power supply)
Features
- Two color screens, 2.8 and 2.4 inches: calls on one, DSS key labels on the other, no paper strips.
- 12 SIP lines and 3 line keys: several numbers or departments on one phone.
- 30 DSS keys across 5 pages: one-touch dialing and transfer to colleagues.
- Dual 10/100/1000 ports with PoE: one cable for phone and PC at full speed.
- 6-way conferencing with G.722 and Opus HD audio: quick, clear phone meetings.