Cloud service telephony providers Your business, our platform

Become or build your business as a cloud telephony provider, without the hassle and cost of creating and managing the technology. Under your brand, use our award-winning ISTRA cloud platform to deliver powerful communication services that take contact to new levels of flexibility, sophistication and ease-of-use. Find out why ISTRA by Enreach is already trusted by over 100 cloud service providers. Whether -  


  • You are an experienced communications company 
  • You are new to this market 
  • You want to offer advanced unified communications (UC) 
  • Or simply sell cloud-based IP telephony 


 - work with us to work wonders for your customers.   

ISTRA by Enreach – your reliable, flexible foundation

Use ISTRA as your starting point for attracting new customer types and exploring market opportunities. Expand into new services: offer contact centre -style functionality, or smart automation including chatbots and conversational AI.  

Our end-to-end cloud-based ISTRA by Enreach platform gives you the reliability, scalability and feature-rich performance to quickly develop, deploy and monetise new business communication services.  

This multi-tenant cloud solution is backed by dedicated R&D and local support, so you focus on customer excellence, without the worry of maintaining the UC platform. With a choice of models and pricing, ISTRA works around a cloud service provider and its customers.  

ISTRA by Enreach is already deployed by over 100 service providers in more than 20 countries, with approximately one million users. It is also the foundation for Enreach’s future-facing platform strategy across the entire group, as part of its ambition to be Europe’s UCaaS leader.  


ISTRA by Enreach includes all the features most users of a cloud service provider will need, and more are added all the time. Here is a quick overview of what is available today: 

  • PBX features – on both fixed and mobile  

  • Unified messaging  

  • Voicemail to email 

  • Boss/secretary filtering 

  • Call barring 

  • Groups management 

  • Enterprise messaging 

  • Interactive voice response (IVR) 

  • Automatic call distribution (ACD) 

  • Audio conferencing 

  • Video conferencing – with screen and sharing  

  • Presence (an advanced status feature developed Enreach) 

Work your way

The choice is yours. Whether you are a fixed-line or mobile operator, integrator or reseller, simply determine the feature packaging and packaging that matches your business model. Offer IP telephony, unified communications and more, from your own data centres, or in the cloud with our shared Platform as a Service (PaaS) model.  

Regardless of which model, you own the brand and the customer relationship 100 percent. 

Existing service providers

  • bring your own carrier 

  • choose your margins 

  • customise new services and create new packages with our APIs 

  • integrate fixed mobile convergence (FMC)  

  • generate extra sales from mobile minutes and data 

Resellers and distributors

  • with UCaaS, anyone can become a cloud service provider 

  • expand your business into new areas with unified communications and fixed mobile convergence (FMC) 

  • simplify roll-out and provisioning 

  • focus on sales and forget about the core network infrastructure powering your portfolio 

  • increase margins, choose your own carrier and offer federated services.  

Tap into a growing market

According to industry experts and market research, the adoption of cloud-based business communications is at an all-time high. As well as cloud PBX solutions, businesses are turning to Unified Communication as a Service (UCaaS), thanks to its flexibility, cost-effectiveness and ease-of-use.  

As they adopt more flexible working models, UCaaS keeps organisations working efficiently and consistently, regardless of where their employees and customers are located. Plus, UCaaS gives every business access to smart functionality only available before to big enterprises with large budgets. 

Benefit from UCaaS

With Unified Communications as a Service (UCaaS) cloud service providers can: 

  • Support customers’ remote workforces 

  • Rapidly roll-out new features and services 

  • Minimise the need for in-house resources 

  • Focus on customers, not technology 

  • Have confidence in reliable uptime and scalability   




  • Save money – reduced capex and opex  

  • Offer more than just IP telephony 

  • Experiment with UC without big commitments  

  • Expand into mobile services with minimal effort 

  • Explore new markets and customer types 

Support remote working

UCaaS is perfect for supporting remote and hybrid working models. It brings together business applications, communications and collaboration seamlessly and intelligently, Also, UCaaS is a great basis for introducing new developments, such as AI services. Businesses can work smart anywhere, anytime, and anyhow, independent of app, device or network, even across mobile. With UCaaS, the user becomes the heart of the contact experience, not the technology.  

Our solutions

Mobile and more

UCaaS gives end users a consistent experience, across all devices, locations, apps and networks. It’s a natural partner for with mobile technology too. This focus on mobility is an area that Enreach has pioneered and won awards for over the years, blending network-driven native fixed mobile convergence (FMC) with UCaaS.  

We’ve been working with forward-thinking cloud service providers who put mobile at the heart of their solutions, rather than these being a siloed afterthought. As well as building successful business for those service providers, their customers enjoy flexible communications that work around them. 

Find out how you and your customers can benefit from a more ‘mobile first’ approach too.

Mobile Cloud PBX

Open new doors with integrations

One size does not have to fit all: cloud service providers can customise services to suit their business models and their markets. Integrate UC with customers’ enterprise processes, such as CRMs, ERPs, specific vertical market tools and more, simply by using ISTRA’s flexible and open API layer. Move beyond communications and contact services and provide an even more complete service to your business audience. 

From simple voice services through to advanced digital transformation strategies, ISTRA by Enreach takes you and your customers in the direction you want to go.  

CRM integrations