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Programmable communication via FlexIO

Build the customer journey you need

  • Pay as you use solution
  • For small and large companies
  • External and internal customers


Integrate voice and SMS applications into your applications and business processes through APIs or using our Visual Designer tool

FlexIO is Proximus' Communication Platform as a Service (CPaaS). FlexIO centralises and improves the communication in your company and with your customers via voice, SMS, e-mail and much more.

Endless possibilities

Digitisation, automation, AI and the cloud are changing the way companies design journeys for customers and employees.

  • Number management tools links telephone numbers to applications
  • Voice AI for answering incoming calls
  • Easily integrate SMS, text messages into your application logic and flow
  • Generate and send OneTime Passwords (OTP) via multiple channels using SMS, voice or e-mail as an extra security layer, without affecting the user experience.

3 use cases to discover FlexIO

Dynamic Interactive Voice Response

  • All-in-one call flow that fits your business
  • Sync it with your CRM, calendar and internal systems
  • Voice AI capabilities to reduce resolution time
  • Build it with the FlexIO APIs or with the Visual Designer

Masked numbers for privacy

  • Protect callers' identities
  • Lower the cost of purchased phone numbers
  • Improves customer experience
  • Prevent off-platform transactions
  • Track and analyse all sessions

Two-factor authentication for security

  • Up to 100% website attacks blocked
  • Secure websites, applications and online transactions
  • Increase customer trust
  • Pay only for success
  • Simple to implement

Cloud-based end-to-end communication

Reliable and efficient

Combines the quality and reliability of Proximus communication services with your own applications using easy to integrate APIs for end to end solutions .

Easy to implement

Zero coding solution and simple drag-n-drop interface with standard action templates that makes simple inbound and outbound voice or SMS scenarios possible for customers without development knowledge.


For all companies which require flexibility of communication to design user journeys, engage with customers and employees. Can be embedded into applications, websites and workflows.

Client / partner

You have an idea or project for which you could use one or more of our API’s?


Register on our developer platform and integrate the API’s into your own applications.

  1. Read the documentation
  2. Register and sign in
  3. Select a price plan


  • Let your customers interact in full respect of their privacy by enabling private calls.
  • Build dynamic voice bots and interactive voice response systems that integrate with your back-end systems.
  • Have your system call or message your customers to let them know about updates to delivery plans.
  • Let customers call your voice system to take new orders or change their delivery address.


  • Let patients have a call with your internal planning system to automatically take appointments.
  • Have your planning system call or message patients to remind them of their upcoming medical appointments.
  • Allocate a unique on-duty phone number that will forwards calls to the right person based on your team calendar.
  • Protect people’s sensitive data by implementing two-factor authentication on your web sites and applications.

Financial services

  • Protect people's sensitive data by implementing two-factor authentication on your web sites and applications.
  • Trigger automated voice calls for due payment reminders to increase the likelyhood of your customer’s reaction.
  • Implement call queuing and call recording to boost your call center’s productivity.
  • Hand over chat conversations to phone calls.

HR services

  • Protect people's sensitive data by implementing two-factor authentication on your web sites and applications.
  • Filter and correctly sort incoming calls with an IVR and create conference rooms on the fly based on the needed interlocutors.
  • Record and archive calls to meet your auditing needs.
  • Remind and confirm appointments automatically with a text message or voice call.
  • Hand over chat conversations to phone calls.