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Get to know us

'Niet lullen, maar poetsen', a Dutch saying that fits perfectly with our Rotterdam roots. We’re eager to make things happen instead of just talking about it. That’s why we keep looking for ways to improve customer service connectivity. Automated when possible, personal if it should be.

Jos van Loo and Thomas Hazelaar

Management Team (f.l.t.r.): Jos van Loo (CEO) and Thomas Hazelaar (Chief Technical Officer).

Voting Sound of Data

Back in the days

Sound of Data was founded in the early 1990s by our current CTO’s father. Way before mobile phones became mainstream and everyone was still calling from landlines. When you could still write a letter to customer service instead of an email. Social media as we know it didn’t exist yet.

Big Dutch television used our platform to manage telephone voting and avoid phone network crashes because of high volumes (Google ‘Henny Huisman-effect’). You could call our information service lines to find out the exact time, weather forecast and to set an alarm. Yes, those were the days.

As technology evolves

Since then, technology has evolved massively and so has Sound of Data. Fast forward to today! Large corporate brands, media companies, and charities optimize their customer service connectivity and interactions with our solutions. On any channel, worldwide.


Their customer service relies on our knowledge and expertise when it comes to infrastructure and telephone accessibility. They use Talk to turn their telephone channel into an online channel and an omnichannel contact center platform to manage their interactions. My Sound of Data and our conversational/AI solutions give them the insights and data they need to make smart decisions and increase the efficiency of their interactions.

Sound of Data voice channel expert
Sound of Data Rotterdam Erasmusbrug

Focus on what you do best

What hasn’t changed since the beginning is the fact that we’re still based in Rotterdam and still a privately owned business. Our customers describe us as very proactive and service-oriented. Got a problem? They know we’ll fix it. Any time of day. If we think their operation can be improved, we won’t hesitate to tell them. That’s why many of them have been with us for years and why we scored an NPS of 85 in our most recent customer satisfaction survey.

And why we continue to innovate so our customers can focus on what they do best, delivering the best customer service possible. Without worries.

"We can turn customer service into a money-maker by using a tool like Talk. It allows us to measure how telephony contributes to online conversion. I can’t think of a nicer mix of customer contact, sales, and marketing."

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Customer Story

"At Ticketmaster we regularly experience incoming call overloads when popular concerts go on sale. With Sound of Data’s Overload Solutions, we can handle these peak calls ourselves even with 3,000 eager customers calling at the same time. No other supplier can offer such a reliable service so easily."

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Customer Story

"Without any effort on our part, we achieved a major conversion increase during the Cruise Control pilot. And it also saves us a lot of time in terms of monitoring."

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Customer Story

"We have been working with Sound of Data for several years for our solutions that include telephony. Here they are our partner for incoming and outgoing telephony and the management of several premium service numbers. We like this cooperation very much. It is easy to communicate with the Sound of Data team and they think along with us. Good technical expertise and stable service which is important for our services."

More about premium service numbers
Datacenter Sound of Data

Making sure

Always compliant

Your international customer service numbers are always compliant.

Flawless routing

Your incoming calls get straight through to the right contact center.

Full control

You are in full control of your inbound call flow and have 24/7 access to all your customer service number statistics and dashboards.

Always compatible

Our services are always compatible with your infrastructure and contact center software. It is our strength to be flexible and versatile.

No obstructions

You're not bothered by capacity and routing limitations caused by local telecoms infrastructure.

24/7 monitoring

Your numbers and routing are monitored 24/7 by our systems and expert staff.

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