Ideal for businesses with variable call volumes seeking a pure pay-as-you-go model.
The recommended choice for high-availability setups and flatrate users.
Combine your SIP Trunk with high-speed business fiber for a total office solution.
Beyond simple connectivity, NFON SIP Trunk provides the technical foundation for enterprise voice. Every trunk is built with high-fidelity security, geo-redundant resilience, and modular scalability as standard.
Distribute phone numbers across multiple trunk lines without purchasing new number blocks, giving you more flexibility and control over your communication setup.
Choose the telephony features, integrations, and add ons your business actually needs, with the flexibility to scale communication as you grow.
Connect IP telephony to your existing PBX infrastructure while keeping your current phone numbers and communication setup fully operational.
Manage communication across multiple locations through one central portal with reliable European connectivity and local support.
Block outgoing calls to selected destinations for enhanced security.
System-controlled monitoring helps detect unusual call-cost patterns and protect your trunk from misuse.
Connect a second PBX for redundancy and even call load distribution across different locations.
Ensure constant coverage with backup systems that kick in when your PBX is unavailable.
Set up and manage your SIP trunks confidently with everything at your fingertips.
Host audio conferences with up to 50 participants easily.
Enable PSTN connectivity for your contact center with minbound and outbound calling.
Connect Microsoft Teams* with PSTN and standard telephony features via Operator Connect or Direct Routing.
Ideal for organisations managing multiple locations or disparate PBX systems that require a single, unified link without moving fully to the cloud.
Organisations looking to integrate cloud benefits and high-end security features without replacing existing physical hardware investments.
Businesses aiming to eliminate wasteful ISDN overhead and move to a transparent, pay-per-channel model that scales with actual usage.
Enterprises with international branches or remote teams requiring reliable, unified connectivity and carrier-grade voice quality across borders.
"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."
“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.”
Our biggest challenge is to stay connected at all times. 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.”
““I would recommend NFON without reservation – I just plug in a new device, and it works.”
The technology that connects Microsoft Teams to the global phone network via your SIP Trunk.
Public Switched Telephone Network—the traditional network your digital trunk bridges into.
The physical or virtual "terminal" where your internal phone logic lives.
The secure process of moving your existing DDIs from a legacy provider to the NFON cloud.
SIP stands for Session Initiation Protocol. NFON SIP Trunk is a VoIP telephony solution that makes your existing telephone system IP-enabled. It connects your telephone system to the public telephone network via the internet. This provides you with flexible scalability, easy integration, high availability, and low telephone costs. Multiple telephone systems and endpoints can be managed under a single SIP trunk, including Microsoft Teams integration.
No, SIP Trunk integrates with your existing PBX systems and supports on-premise connectivity.
Absolutely, our support team is available 24/7 to assist you.
All prices can be found here.
Please note that these prices are only valid for Germany and prices vary across countries.
You can port (take) your existing phone numbers (MSN) to NFON SIP Trunk if you already use geographic phone numbers with another provider. Learn more at https://portierung.nfon.com/
A SIP trunk is a connection that allows a telephone system to make calls over the internet. It replaces traditional ISDN or analogue lines. Explained briefly and clearly:
Your telephone system (PBX) connects to the SIP provider via the internet.
The connection uses the SIP (Session Initiation Protocol) to establish, control, and terminate calls.
The voice data itself is transmitted as VoIP data packets.
The SIP provider routes calls to the public telephone network or receives incoming calls.
Yes, our flexible number routing allows you to retain and assign your existing numbers without purchasing new blocks.
We prioritise security with features like call blocking and fraud detection to protect your communications.
A private mobile phone number cannot usually be used directly as a phone number for an NFON SIP trunk. NFON SIP trunks support the use of geographic phone numbers (landline numbers) that are ported or newly assigned.
