What are VoIP Gateways?

VoIP Gateways allow you to use standard PSTN lines (Analog, BRI or E1/T1 PRI lines) with 3CX. There is no need to use a VoIP provider – if you have a good telecoms provider PSTN lines can still provide a very reliable service.

Many businesses are upgrading from legacy phone systems to modern VoIP setups like 3CX. But replacing everything at once can be disruptive and costly. VoIP Gateways offer a middle ground - converting IP-based traffic to PSTN-compatible audio - allowing IT teams to modernize in stages.

A VoIP gateway can help you get the modern advantages of a VoIP system, whilst still benefiting from the familiarity of your existing devices and equipment. Keep reading to find out more:

Why use a VoIP gateway?

  • Migrate in Phases - Keep your existing hardware to stagger the cost of your migration.
  • Use Familiar Equipment - Reduce training and setup times, staff retain their existing devices.
  • Convert Incoming PSTN Lines to VoIP/SIP - Make and receive calls using the PSTN network.
  • Call using a VoIP service provider - Reduce interoffice costs by routing the calls via the Internet.
beroNet VoIP Gateways

What types of VoIP gateways are there?

  • Analog units - Analog units are used to connect regular analog phone lines to the gateway. Analog units are available for between 2-24 lines.
  • Digital units - Digital units allow you to connect digital lines, either one or more BRI ISDN lines (Europe), one or more PRI/E1 lines (Europe) or one or more T1 lines (USA).

VoIP gateway manufacturers

There's a great selection of VoIP gateways available today, and as demand has increased, prices have decreased considerably. Analog VoIP gateways start at a very low price!

3CX can work with a wide range of VoIP Gateways. Guides to configuring popular gateways can be found below. Any support queries regarding the gateways should be routed straight to the vendors themselves.

Further reading

Last Updated
This document was last updated on 4 July 2025
https://www.3cx.com/pbx/voip-gateway/