1 cable connecting 2 worlds.

Ready to elevate your communications? Take your first step toward cloud-based communication with SIP Trunk Flexx - a flexible, scalable, and secure VoIP telephony solution tailored for modern businesses.

Maximised flexibility
Hassle-free integration
On-premise telephony solution

SIP Trunk Flexx unleashes flexible communication.

Europe-wide scalability.

Expand your business across Europe with one unified product.

Flexible number assignment.

Assign phone numbers from one block to different PBX systems without purchasing new blocks.

Cost-efficient.

Eliminate redundant tasks with pre-configured bots that detect common customer issues, saving you the manual work of training.

Vendor certifications.

We are certified with many PBX vendors for seamless compatibility.

SIP the Trunk the way you want.

One system for all.

SIP Trunking allows businesses with multiple locations to centralize their communication infrastructure, eliminating the need for separate phone systems at each site.


With SIP Trunk Flexx, calls are routed over the internet, reducing costs associated with traditional phone lines and enabling free internal calls between locations, whether they're in the same city or across the globe.

No call is ever missed.

For companies with fluctuating call volumes, such as customer service centers or seasonal businesses, SIP Trunk Flexx provides flexible, scalable call capacity.


Instead of being limited to a fixed number of physical lines, businesses can adjust their call capacity to match demand, ensuring they never miss calls during peak times and avoid unnecessary expenses during off-peak periods.

Always there for you.

SIP Trunking enhances business continuity by allowing calls to be rerouted automatically in case of service disruptions. For example, if a natural disaster or power outage affects a location, calls can be seamlessly redirected to other locations or mobile devices, ensuring uninterrupted communication with clients and partners.


This resilience is crucial for businesses in sectors that require constant connectivity, like healthcare or financial services.

Certified telephone systems and devices.

See how others are succeeding with NFON.

"Instead of having different PBX systems for each location, we can now use one single, easily scalable communication solution. The integration of Cloudya has given our teams a lot more flexibility."

Tobias Armleder

IT Lead, Demeter

“Since we switched to NFON, we can finally take calls wherever we are and from any device. The integrations with Microsoft Teams have made things a lot easier, and we can use the whole Microsoft Teams suite, with any client or partner - just being a click away at all times.”

Jeanne Beck,

Marketing Manager, Wefapress

Our biggest challenge is to stay connected at all times. That’s why telephony is a key priority for us. NFON offered us a cloud communication platform that can cover all our needs. Thanks to Cloudya’s seamless integration with Microsoft Teams, we can now make calls directly from the app and benefit from streamlined workflows and insightful reporting with Nmonitoring Queues.”

Fritz Pschormeir

Head of IT Infrastructure, financial.com

““I would recommend NFON without reservation – I just plug in a new device, and it works.”

Dominic Muskulus

Head of IT

Connect for success

SIP Trunk Flexx is in sync with your existing software tools.

Numerous integration options make SIP Trunk Flexx a real all-rounder and add advanced customer service functions to your business software, for productivity on a new level.

Frequently Asked Questions.

Do I need new hardware to use SIP Trunk Flexx?

No, SIP Trunk Flexx integrates with your existing PBX systems and supports on-premise connectivity.

Can I keep my current phone numbers?

Yes, our flexible number routing allows you to retain and assign your existing numbers without purchasing new blocks.

Is customer support available?

Absolutely, our support team is available 24/7 to assist you.

How does SIP Trunk Flexx enhance security?

We prioritize security with features like call blocking and fraud detection to protect your communications.

Ready to get started? Let's do this