Grandstream GXW4216 16-Port FXS Gateway with Gigabit Port

The Grandstream GXW4216 puts 16 analog phones or fax machines on an IP PBX or SIP provider through a single Gigabit port. It fits offices, clinics and branches that have moved to IP telephony but want to keep their existing handsets.

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The Grandstream GXW4216 connects 16 analog phones or fax machines to an IP PBX or a SIP provider over a single Gigabit network port. It is the smallest model in the GXW4200 high-density series: a 1U box for offices, clinics and branches that have moved to IP telephony but still have analog handsets on desks and copper wiring in the walls.

Grandstream GXW4216 at a glance

The front panel carries 16 RJ11 ports and a backlit LCD that shows device status. On the rear you get one 50-pin Telco (RJ21) connector, the network port and the DC input.

• 16 FXS ports, each with its own SIP account.
• One 10/100/1000 Mbps RJ45 port.
• 4 SIP server profiles per device.
• Line reach up to 6000 ft (about 1.8 km) on 24 AWG at 2 REN.
• 12V 5A power adapter, 60W maximum.

Keep your analog phones on an IP PBX

Replacing an old phone system usually leaves a stack of analog handsets with nowhere to plug in. Each GXW4216 port registers to the PBX as its own SIP extension, so an old desk phone gets an internal number and can take and transfer calls like an IP phone. Supported features include caller ID, call waiting, blind and attended transfer, call forwarding, do not disturb, three-way conferencing per port and message waiting indication.

Fax and voice quality

Fax machines in accounts or procurement run over the network with T.38 at up to 14.4 kbps, falling back to G.711 pass-through when needed. Codecs include Opus, wideband G.722 and G.729, backed by line echo cancellation and a dynamic jitter buffer that smooths out audio on a busy LAN.

Management and security

Configure the gateway from a web browser or from a voice menu on any connected phone. For several sites, Grandstream's GDMS cloud platform or TR-069 handles central management. Calls can be encrypted with SRTP and signaling with TLS, the device uses secure boot and a random default password, and a failover option moves registrations to a backup SIP server if the main one goes offline.

Typical uses in Saudi Arabia

• A Riyadh clinic with analog phones in exam rooms and at reception.
• A Jeddah law or accounting office that wants to keep its fax machines.
• A Dammam branch linking its existing handsets to the head-office PBX over the network.
• A small hotel or rest house with around 16 room and reception phones.

Compatibility

The GXW4216 speaks standard SIP (RFC 3261) over UDP, TCP or TLS, so it registers to any SIP PBX or directly to an internet telephony provider. With Grandstream UCM PBXs, Grandstream lists zero-configuration provisioning. Ports can also be grouped into hunting groups that share one SIP account, so a single number reaches a whole team.

GXW4216 or GXW4224?

Both use the same 1U chassis, LCD and 12V 5A adapter; the only difference is port count, 16 versus 24. If you have 12 to 16 analog phones today, the GXW4216 is enough. If you expect growth soon, start with the GXW4224. For 8 phones or fewer, the 8-port HT818 V2 is a better size.

Frequently Asked Questions

Does the GXW4216 work with a Grandstream UCM?

Yes. It works with any SIP PBX, and Grandstream lists zero-configuration provisioning with its UCM series.

Can I connect a fax machine?

Yes. It supports T.38 fax up to 14.4 kbps and falls back to G.711 pass-through when needed.

Is it powered over PoE?

No. It runs on the included 12V 5A adapter; the network port carries data only.

Specifications

• Model: GXW4216
• Series: GXW4200 (GXW4216 / GXW4224 / GXW4232 / GXW4248)
• Type: 16-port high-density FXS gateway
• Telephone interfaces: 16 × 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: 2.40 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

• 16 FXS ports, one SIP account each: every analog handset becomes a numbered extension on the PBX.
• One 10/100/1000 Mbps port: a single cable carries all 16 lines to the network.
• T.38 fax up to 14.4 kbps: fax machines keep working over the LAN without a landline.
• 4 SIP profiles plus failover server: register to more than one PBX or provider and switch over automatically.
• 1U chassis, 185 mm deep: fits a 19-inch rack or sits on a desk.