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Modern telephony built on what you have already
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Full telephony features.
NFON SIP Trunk includes all the core capabilities you need for modern business telephony. From voice channel management and number routing to call forwarding, blocklists, and conferencing, it’s all ready to go. Here’s a quick look at three key features:
Block Calls: Restrict outbound calls to selected destinations with just a few clicks.
Detect Fraud: Security comes first. We monitor call activity to help prevent fraudulent use of your platform.
Host Audio Conferences: Easily set up audio conferences with up to 50 participants, no extra tools required.
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Flexible routing options for managing phone numbers efficiently.
Assign phone numbers without the need to purchase new blocks. Numbers from a single block can be distributed across multiple trunk lines — giving you more control and reducing costs.
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Intuitive portals for full control
With the self-service portal for our SIP Trunk, you stay in control at all times. Manage phone numbers, configure locations, and set up forwarding or backup routing — all on your own terms.
Two clear portals support you: one for technical setup and SIP Trunk configuration, and one for managing contracts, number blocks, and billing.
Everything you need — instantly accessible and easy to use.
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As much as you need. As flexible as you want.
NFON SIP Trunk adapts to your business needs. The base package includes essential telephony features like call management, forwarding, blocklists, backup, and built-in security.
With the premium package, you get high availability options and conferencing services. Additional add-ons are available — including Microsoft Teams* integration, eFax, and contact center connectivity.
You get exactly the features you need — and only pay for what you actually use.
Discover the benefits.
Scale flexibly: Exactly when you need to.
Easily add or reduce voice channels and trunks as your needs change. Perfect for growing teams or seasonal spikes in call volume.
Stay connected.
Extend your on-premise phone system with IP telephony and keep your existing phone numbers, no disruptions, no compromises.
Manage centrally, use across Europe.
Connect multiple locations efficiently with centralised control via the portal and local support on the ground.
Achieve cost efficiency.
Benefit from cost-effective call rates and add optional features as needed, tailored to fit your business perfectly.
Everything that matters.
NFON SIP Trunk brings together a wide range of powerful features, from flexible routing and high availability to Microsoft Teams* integration. Perfect for businesses that expect more than just a connection.
Data protection, made in Germany
NFON SIP Trunk is operated in Germany and meets the highest security and data protection standards in full compliance with GDPR.
All the features you need, always available.
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NFON SIP Trunk sets your people free.
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Easy.
NFON SIP Trunk provides a flexible, easy setup for your business. Configure multiple phone systems and PBX endpoints, like Microsoft Teams*, all within a single trunk setup.
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Flexible.
With the number routing service, effortlessly direct your ported MSN numbers and other number blocks to any PBX on your SIP Trunk, offering unmatched flexibility for your setup.
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Reliable.
NFON provides a fully redundant architecture, end-to-end data security, and in-house managed voice services. This approach maximizes uptime, ensuring 99.9% platform availability, so you’re always accessible to your customers.
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Frequently asked questions.
What is NFON SIP Trunk?
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.
How does a SIP Trunk work?
A SIP trunk is a connection that allows a telephone system to make calls over the internet. It replaces traditional ISDN or analog 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.
Do I need new hardware to use SIP Trunk?
No, SIP Trunk 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 enhance security?
We prioritize security with features like call blocking and fraud detection to protect your communications.
How much does NFON SIP Trunk cost?
All prices can be found here.
Please note that these prices are only valid for Germany and prices vary across countries.
How many calls are possible per SIP trunk?
How can I port my phone number to an NFON SIP trunk?
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/
Can I use my mobile phone number for VoIP?
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.
