Grandstream GXW4104 Analog FXO IP Gateway – 4 Port

The Grandstream GXW4104 is a four-port analogue FXO gateway: it connects four real telephone lines to a SIP platform, so an IP phone system can make and take calls on lines that were installed long before it.

FXO plugs into a line; FXS plugs into a phone. That is the distinction to get right before ordering. Keeping four existing telephone lines while moving the handsets to IP needs FXO — this. Keeping an old analogue handset or a fax machine alive on a VoIP system needs FXS, which is a different product entirely.

This is the previous generation, and that is worth saying plainly. The HT841 supersedes it with the same four-port FXO function plus an FXS port, three SIP profiles, lifeline support and current provisioning. The GXW4104 remains a perfectly serviceable gateway and is often the cheaper answer for a straightforward four-line job or a like-for-like replacement of an existing unit — but on a new install, look at the HT841 first.

Key features

• 4 FXO ports — four analogue lines from the exchange or a PBX
• 4 concurrent calls — one per port
• T.38 fax over IP — the protocol that makes fax survive an IP network
• SIP-based — works with Grandstream UCM and third-party IP PBX platforms
• Compact desktop unit — sits in a comms cupboard beside the line terminations
• Remote provisioning and management — configurable without a site visit

Works with

• Grandstream HT841 — the current four-port FXO gateway that replaces it
• Grandstream GXW4108 — the eight-port version of this generation
• Grandstream HT814 — the FXS equivalent, for analogue phones and faxes
• PSU for GXW4104 and GXW4108 — spare or replacement mains adapter
• Grandstream UCM6302 IP PBX — the platform to register it to
• All Grandstream gateways

Frequently asked questions

FXO or FXS — which do I need?

FXO connects to a line; FXS connects to a phone or fax. If you are keeping existing telephone lines on a new IP system, FXO is right. If you are keeping an old handset or fax working, you need FXS instead.

Should I buy this or the HT841?

On a new installation, the HT841 — it adds an FXS port, lifeline support, three SIP profiles and current provisioning. Buy the GXW4104 to match an existing estate, or where the budget decides it.

How many ports do I need?

One per simultaneous call, not one per line you own. Look at your busiest hour rather than the number of lines on the bill.

Will fax work through it?

It supports T.38 fax over IP, which is what lets a fax survive an IP network. Fax remains fussy — test with the actual machine before committing.

Does it work with a non-Grandstream PBX?

Yes. It is a standards-based SIP device and is widely deployed against third-party IP PBX platforms as well as Grandstream's own UCM range.

Is it still supported?

It is a previous-generation product still in the range. If long-term firmware support matters for the deployment, the HT841 is the safer specification.

Migrating from analogue lines to SIP? Call 0333 242 1314 or email sales@clisecure.com and we will tell you whether this or the HT841 fits your site.