Grandstream GXW4224 24-Port FXS Gateway with Telco Connector

The Grandstream GXW4224 brings 24 analog lines onto an IP PBX through one Gigabit port, with front RJ11 jacks and a rear 50-pin Telco connector. It suits schools, small hotels and offices running 16 to 24 analog phones or fax machines.

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The Grandstream GXW4224 puts 24 analog lines on an IP PBX through one Gigabit network cable. Picture a private school with phones in the admin office, staff rooms and labs, plus a fax at the front desk. Instead of buying an IP phone for every room, plug the existing handsets into this gateway and they all become extensions on the new phone system.

Grandstream GXW4224 ports and layout

The front panel has 24 RJ11 jacks and a backlit LCD; the rear has a 50-pin Telco (RJ21) connector and the network port.

• 24 FXS ports, one SIP account per port.
• One 10/100/1000 Mbps RJ45 port.
• Multi-language graphic display for device status.
• A per-port LED that lights when the line is busy.

Clearer audio on analog handsets

Codec support covers Opus and G.722 at 16 kHz alongside G.711, G.729 and iLBC. Line echo cancellation and a dynamic jitter buffer handle packet delay, so calls stay intelligible when the network is carrying other traffic. If a device sends data down the line, such as a modem, the gateway detects it and switches to G.711 automatically to keep the signal clean.

Fax, paging and full calling features

Fax runs over T.38 at up to 14.4 kbps. Every port supports caller ID in several formats, call waiting, transfer, do not disturb, three-way conferencing, paging, auto dial and last call return. Voicemail alerts show on phones with a NEON lamp or as a stutter dial tone.

Security and remote management

Calls are protected with SRTP, accounts with TLS and AES encryption, and every unit ships with a unique certificate, a random password and dual firmware images. Manage it through the web UI or SSH, or centrally through GDMS, with a failover SIP server it switches to on its own.

Where it fits in Saudi Arabia

• Schools: admin, classroom and lab phones on one PBX.
• Small hotels and furnished apartments with up to 24 rooms.
• Warehouses in Dammam and Jeddah where phones sit far apart.
• Government and private offices that still rely on fax.

Compatibility

The GXW4224 uses standard SIP (RFC 3261), so it registers to any SIP PBX or voice provider. Grandstream lists zero-configuration provisioning with its UCM PBXs. With 4 SIP profiles, you can point some ports at one PBX and others at a different provider, for example admin phones on the school PBX and the fax line on a separate provider.

GXW4224, GXW4216 or GXW4232?

The GXW4216 has 16 ports and the GXW4224 has 24; both have one Telco connector, a 12V 5A adapter and similar weight. The GXW4232 packs 32 RJ11 ports and two Telco connectors into the same chassis. Pick the GXW4224 for 17 to 24 phones, and step up to the GXW4232 beyond that.

Frequently Asked Questions

How many phones can the GXW4224 handle?

24 analog phones or fax machines, each with its own SIP account on the PBX.

Can it go in a rack?

Yes. It is 1U and ships with two rack-mount brackets for a 19-inch rack; it can also sit on a desk.

Specifications

• Model: GXW4224
• Series: GXW4200 (GXW4216 / GXW4224 / GXW4232 / GXW4248)
• Type: 24-port high-density FXS gateway
• Telephone interfaces: 24 × RJ11 FXS + 1 × 50-pin Telco (RJ21) connector
• Network interface: 1 × 10/100/1000 Mbps auto-sensing RJ45
• LED indicators: Power, LAN link, LAN activity, per-port connection
• Display: Backlit graphic LCD, multi-language
• SIP accounts: 4 SIP server profiles per device, independent SIP account per port
• Signaling: SIP (RFC 3261) over UDP / TCP / TLS
• Network protocols: TCP/UDP, RTP/RTCP, HTTP/HTTPS, ARP, ICMP, DNS, DHCP, NTP, TFTP, PPPoE, STUN, LLDP
• Voice codecs: G.711, G.722 (wideband), G.723.1, G.726-32, G.729, iLBC, Opus
• Voice processing: Carrier-grade line echo cancellation, dynamic jitter buffer, modem detection and auto-switch to G.711
• Fax over IP: T.38 Group 3 fax relay up to 14.4 kbps, auto-switch to G.711 pass-through (V.17, V.21, V.27ter, V.29)
• Telephony features: Caller ID display or block, call waiting, blind or attended transfer, call forward, DND, 3-way conference, last call return, paging, MWI (NEON LED) and stutter tone, auto dial
• Caller ID: Bellcore Type 1 & 2, ETSI, BT, NTT, DTMF-based
• Disconnect methods: Busy tone, polarity reversal / wink, loop current
• Line reach: Up to 6000 ft on 24 AWG at 2 REN (short / long haul)
• DTMF: In-audio, RFC 2833, SIP INFO
• QoS: DiffServ, TOS, 802.1P/Q VLAN tagging
• Provisioning: TFTP, HTTP, HTTPS, FTP, FTPS, TR-069; zero-config provisioning with Grandstream UCM
• Security: SRTP, TLS/SIPS, HTTPS (AES-128), secure boot, unique certificate and random password per device, dual firmware images
• Management: Web UI, HTTPS, SSH, Syslog, voice prompt menu, TR-069, GDMS
• Failover SIP server: Yes, automatic switch to secondary server
• Power supply: External adapter: output 12VDC, 5A, 60W max; input 100 to 240VAC, 50 to 60Hz
• Protection: Over-voltage and over-current protection (ITU-T K.21 Basic Test Level)
• Mounting: Desktop or rack mount with front brackets (1U)
• Dimensions: 440 x 185 x 44 mm (1U)
• Weight: 2.60 kg
• Environment: Storage -10 to 60°C, humidity 10 to 90% non-condensing
• Compliance: FCC Part 15 Class B, IC ICES-003, CE (EN55032, EN55035, EN IEC 61000-3-2, EN61000-3-3, EN IEC 62368-1), RoHS, C-Tick, UL 60950 (adapter)
• In the box: Gateway, RJ45 Ethernet cable, 12V 5A power adapter, 2 rack-mount brackets, quick installation guide, regulatory paper

Features

• 24 RJ11 FXS ports: 24 phones or faxes, each with its own extension number.
• Opus and G.722 codecs: 16 kHz wideband audio on handsets that support it.
• Up to 6000 ft on 24 AWG: reach phones in distant floors or buildings from the server room.
• GDMS and TR-069 management: monitor and update the gateway remotely without a site visit.