GXW42XX V2 – Quick Installation Guide

  • Updated on June 25, 2026 PDF Download

OVERVIEW

The GXW42XX V2 high-density FXS gateway series enables businesses of all sizes to create a cost-effective hybrid IP and analog telephone system that offers the benefits of VoIP communications and takes advantage of Gigabit speeds while preserving investment in existing analog phones, fax machines, and legacy PBX systems. The GXW42XX V2 series includes 16/24/32/48 FXS ports, and a Gigabit network port, and features broad interoperability with most service providers, soft-switches, and SIP-based environments.

Precautions

  1. Do not attempt to open, disassemble, or modify the device.
  2. Do not expose this device to temperatures outside range of 0 °C to 40 °C (in operation) and -10 °C to +60 °C (in storage).
  3. Do not expose the GXW42XX to environments outside of the following humidity range: 10-90% RH (non-condensing).
  4. Do not power cycle the GXW42XX during system boot up or firmware upgrade. You may corrupt firmware images and cause the unit to malfunction.
  5. Please use the power supply included in the device packaging, as using other uncertified alternative power adapters may damage the device.
  6. Please take lightning protection measures during installation (a lightning rod is required and the device must be reliably grounded). It is recommended to use a surge protection device.

PACKAGE CONTENTS

CONNECTING THE GXW42XX V2 SERIES

Refer to the illustration below when following the instructions.

Front panel shows multiple FXS ports, status LEDs, and an LCD screen for device information and controls.
GXW42xx V2 Description

CONNECTING THE GATEWAY

  1. Connect a standard touch-tone analog telephone (or fax machine) to the FXS analog port on the front panel. Note: The GXW4248 V2 does not have individual FXS ports on the front panel; instead, it uses female RJ21 Telco (Amphenol) connectors on the rear panel. Use the included male RJ21 Telco cable to connect the gateway to analog devices or a patch panel. For more details, see section “Telecom Port Installation.
  2. Insert the Ethernet cable into the LAN port of GXW42XX V2 and connect the other end of the Ethernet cable to an uplink port (a router, a modem, etc.).
  3. Using the embedded web server or IVR (Interactive Voice Prompt) menu, you can further configure the gateway using either a static IP or DHCP.

GXW42XX V2 CONFIGURATION

Configure using Interactive Voice Prompt

From the analog phone, press *** to get into the IVR menu. Follow the voice instruction, and configure the setting.

Configure using embedded Web server

  1. From the analog phone, press *** to get into the IVR menu. Enter option 002 to obtain the Gateway’s IP address.
  2. Type the device’s IP address in your PC browser.
  3. Log in using the password printed on the label to configure the gateway.

You will need the following information to configure the GXW42XX V2 series via the web browser:

  • IP address, subnet mask, and gateway IP if using static IP.
  • Each SIP server and/or Outbound Proxy FQDN or IP address for one Profile (4 in total).
  • User subscriber information: User ID, Authentication ID, Password under FXS port label.
  • Please contact your ITSP for additional settings that may be necessary to configure the device.

TELECOM PORT INSTALLATION

GXW42XX V2 uses a 50-pin female RJ21 Telco (Amphenol) port as an alternative interface (for GXW4248 V2, the Telco port is mandatory) for connecting analog devices such as telephones or fax machines.

When installing the Telco port, a standard male RJ21 Telco Amphenol 50-pin 25-pair cable is required (included with the GXW4248 V2 package only). The cable can be connected to an RJ11 patch panel, which helps organize wiring in most installation scenarios.

Diagram of a network device showing a LAN port and DC IN on the rear, two analog ports, and a separate RJ11 patch panel connected by cables; header labels visible.
GXW42xx V2 Port Installation
Note:

Only the GXW4248 V2 package includes two Telco cables, each featuring a male RJ21 (50-pin) to 25 blunt pair header for direct connection to analog lines.

The following table shows the correspondent relation between the No. of each Telco cable’s RJ11 crystal head and the real FXS port number of GXW42XX V2.

To ensure proper lightning protection, install a lightning rod, reliably ground the device, and use a surge protection device as pictured below.

Back panel showing two analog ports labeled 'Analog Ports' with a connected probe and a 'Must Attach' warning badge nearby.
GXW42xx V2 Lightning Protection and Grounding
Note:

Row “Right” indicates the righthand side telco port, when you facing the back panel of GXW42XX V2, and “Left” is the left telco port.

The GXW42XX V2 Series is not pre-configured to support or carry emergency calls to any type of hospital, law enforcement agency, medical care unit (“Emergency Service(s)”) or any other kind of Emergency Service. You must make additional arrangements to access Emergency Services. It is Your responsibility to purchase SIP-compliant Internet telephone service, properly configure the GXW42XX V2 series to use that service, and periodically test your configuration to confirm that it works as You expect. If You do not do so, it is Your responsibility to purchase traditional wireless or landline telephone services to access Emergency Services.

GRANDSTREAM DOES NOT PROVIDE CONNECTIONS TO EMERGENCY SERVICES VIA THE GXW42XX V2 SERIES. NEITHER GRANDSTREAM NOR ITS OFFICERS, EMPLOYEES, OR AFFILIATES MAY BE HELD LIABLE FOR ANY CLAIM, DAMAGE, OR LOSS, AND YOU HEREBY WAIVE ANY AND ALL SUCH CLAIMS OR CAUSES OF ACTION ARISING FROM OR RELATING TO YOUR INABILITY TO USE THE GXW42XX V2 SERIES TO CONTACT EMERGENCY SERVICES, AND YOUR FAILURE TO MAKE ADDITIONAL ARRANGEMENTS TO ACCESS EMERGENCY SERVICES IN ACCORDANCE WITH THE IMMEDIATELY PRECEDING PARAGRAPH

For Certification, Warranty, and RMA information, please visit
www.grandstream.com

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