As the PSTN (Public Switched Telephone Network) shut-off approaches, businesses still relying on ISDN lines face a critical challenge: how to maintain voice connectivity without costly downtime or a complete infrastructure overhaul. The answer? An ISDN to SIP converter.

We’ll explain what an ISDN to SIP converter is, why it’s essential during the PSTN switch-off, and how Becketts Teams-Enabled SIP Trunks can help you migrate to Microsoft Teams with zero disruption.

What is an ISDN to SIP Converter?

An ISDN to SIP converter is a gateway device that bridges your legacy ISDN-based PBX system with modern SIP-based VoIP networks. It translates ISDN signaling into SIP, allowing you to keep your existing hardware while connecting to IP telephony services.

Key Features:

  • ISDN Support: Handles BRI (Basic Rate Interface) and PRI (Primary Rate Interface).
  • SIP Connectivity: Integrates with VoIP providers over IP networks.

Why Do You Need It During the PSTN Shut-Off?

When PSTN services are retired, ISDN lines will stop working. Without a migration plan, your business risks losing voice connectivity. An ISDN to SIP converter offers a cost-effective, low-risk solution:

  • Avoid Immediate PBX Replacement: Keep your existing system while transitioning to SIP.
  • Future-Proof Your Communications: SIP is the global standard for IP telephony.
  • Reduce Costs: SIP trunks are more affordable than ISDN lines.
  • Ensure Business Continuity: No service interruptions during migration.

 How Does It Work?

  • Connects to your ISDN PBX on one side and SIP provider on the other.
  • Translates signaling and media between ISDN and SIP.
  • Enables seamless call flow between legacy and IP systems.

Migrating to Microsoft Teams with Zero Downtime Using A SIP Gateway

With ISDN now removed you’ll need SIP Trunks – these provide the connectivity to the outside world to enable you to make and receive calls.  Our SIP Trunks also provide connectivity to Microsoft Teams allowing you to route calls through Teams without replacing your PBX

Benefits of Becketts SIP Trunks:

  • Zero Downtime Migration: Keep your existing ISDN or SIP infrastructure running while gradually moving users to Teams.
  • Direct Integration: Native connectivity to Teams—no extra hardware required.
  • Hybrid Flexibility: Run Teams alongside your current phone system until you’re ready to fully migrate.
  • Cost Efficiency: Avoid expensive licensing and infrastructure changes.

Why Becketts?

  • Proven expertise in PSTN migration.
  • Secure, reliable SIP trunking with Teams compatibility.
  • Scalable solutions tailored to your business needs.

Ready to Future-Proof Your Business?

The PSTN shut-off is coming—don’t wait until it’s too late. With an ISDN to SIP converter and Becketts Teams-Enabled SIP Trunks, you can migrate smoothly, avoid downtime, and unlock the full potential of Microsoft Teams.

Click on the link below or call us on 0118 940 9000 today to start your migration journey and ensure your business stays connected.