Grandstream GXW4216 Analog FXS IP Gateway- 16 Port

The Grandstream GXW4216 connects 16 analogue phones or fax machines to a VoIP system. This is the original GXW4216 — the long-serving workhorse of the GXW4200 range, deployed for years in offices, surgeries, schools and hotels that kept their analogue handsets while the platform behind them went to SIP.

Each port behaves like its own extension. Plug in the analogue device, register the port to the PBX or provider, and the handset keeps working exactly as it did — same ring, same dial tone, same fax machine — while the call travels over the network.

The 50-pin Telco connector is the installer's detail worth noticing. Alongside the 16 individual RJ11 sockets there is a single Telco connector, so on a site with existing structured cabling the whole gateway lands on a punch-down block with one cable instead of sixteen. A newer revision of this gateway exists as the GXW4216 V2; the job they do is the same.

Key features

• 16 FXS ports — each one an independent analogue extension
• RJ11 sockets plus a 50-pin Telco connector — port-by-port or one cable to the block
• Gigabit network port — no bottleneck at the gateway
• T.38 fax relay — Group 3 fax over IP rather than fax over a voice codec
• Wide codec support — G.711, G.723.1, G.726, G.729A/B and iLBC
• 3-way conferencing per port — available on every analogue extension
• Full analogue feature set — transfer, forward, call waiting, DND and message waiting indication
• TLS and SRTP — signalling and media encryption
• Automated provisioning — TR-069 and XML configuration at scale rather than port by port

Works with

• GXW4216 V2 — the current revision of this gateway
• GXW4224 V2 — 24 ports
• GXW4232 V2 — 32 ports
• HT818 — 8 ports, for a smaller site
• PSU for GXW4216 / 4224 / 4232 — spare or replacement power supply
• Grandstream UCM IP PBX range — register the ports to an on-site PBX

Frequently asked questions

Will my existing analogue phones just work?

Yes. An FXS port supplies line voltage, dial tone and ring current exactly as an analogue exchange line does, so the handset behaves normally. Nothing changes for the person using it.

What is the 50-pin Telco connector for?

Bulk cabling. Instead of running sixteen individual RJ11 leads, an installer runs one 25-pair cable from the gateway to a punch-down block and terminates the extensions there — the way analogue PBXs were always wired. On a site that already has that cabling, it saves hours.

Do fax machines actually work over this?

Fax is the part worth planning. The gateway supports T.38 fax relay, which carries the fax as data rather than trying to squeeze fax tones through a voice codec — that is what makes it reliable. Your provider or PBX also has to support T.38 at the other end.

This or the V2?

They do the same job — 16 FXS ports onto SIP. The V2 is the newer revision; this original remains a standards-based gateway that registers to the same platforms. If you are matching an existing estate of GXW4216s, staying consistent is a fair reason to buy the same unit.

How many ports do I actually need?

One per analogue device, not per user. Count the handsets, fax machines, lift phones, door entry panels and alarm diallers. It is common to find more analogue devices in a building than anyone expected.

Wiring a site through the Telco connector, or counting ports? Call 0333 242 1314 or email sales@clisecure.com and we will size the gateway before you order.