About

Voice as an application — not infrastructure.

CallerConnect runs the voice plumbing behind Microsoft Teams calling for MSPs, resellers, and enterprises across Europe. The shift in paradigm: end-users and partners shouldn't have to think about SIP trunks. They shouldn't even know they exist.

The paradigm shift

Voice should feel like an app, not a project.

The old world

Voice is treated as infrastructure.

Direct Routing licences, identity sync that breaks every quarter, carriers that don't talk to identity providers, audit trails that live in three different consoles. Operators and end-users alike are pulled into low-level decisions about gateways, trunks, and routing — when all they wanted was for a call to connect.
The shift

Voice should be an application.

Our philosophy: end-users and partners should treat voice the same way they treat any modern app — install it, configure it, use it. Not operate it. We carry the SIP trunks, the carrier interconnects, the identity sync, the failover, and the audit trails — plus the steady stream of platform changes, new Microsoft Graph features, carrier-protocol shifts and regulatory updates that come with a fast-moving landscape. We absorb them upstream so nothing breaks downstream. Partners get a console with their customers in it. End-users open Teams and dial. The infrastructure, and its constant evolution, stays out of sight by design.
How we run

Four things we never compromise on.

These aren't aspirations — they're the daily defaults engineering pushes back on every spec.

Who we are

A small team of voice infrastructure veterans, headquartered in Sint-Michielsgestel, the Netherlands. Backgrounds in carrier-grade SIP, Microsoft Graph, identity sync, and the kind of telecom regulation that makes most engineers cry. We’ve shipped voice in production for over a decade — sometimes other people’s products, now ours.

The product team is intentionally small. Customers talk directly to the people writing the code. Roadmap conversations happen in shared Slack channels with our largest MSPs, not in customer-success ticket queues.

We hire infrequently and carefully. If you’re a senior backend engineer, voice/SIP specialist, or technical-account manager who likes operators more than enterprise sales decks, drop us a line.

Want to see it run on your tenant?

30 minutes, your carrier, your identity provider, your scenario. No slides.