Title Hero with Post Luxembourg Building

Success Story: Service Provider

The Post Luxembourg Success Story with Callisto!

“For POST Telecom, it’s good to know that there are virtually no boundaries with Callisto – good for POST Telecom and good for its customers.”

POST Telecom Luxembourg

Outsourcing communications infrastructure – yes or no? – To make this decision easier for companies, POST Telecom, the leading provider of telecommunications services for private and business customers in Luxembourg, has developed an attractive offer in partnership with CTModule and Cisco.


POST Telecom creates customized solutions for customers with special requirements. The challenge is that tailor-made solutions are often in direct conflict with the required market price. In addition, multilingualism in the telecom business is an important factor for the Luxembourgish clientele. For POST Telecom it is therefore extremely important to keep the costs of the solution calculable and as low as possible throughout the entire supply chain. In order to be able to offer all the required services to its demanding customers from a wide range of industrial and service sectors, POST Telecom therefore needed a strong, trustworthy, cost-conscious and flexible technology partner.


When a corporate customer replaces his existing telephone infrastructure, he wants to buy added value with his new solution. He assumes that the new solution will fulfill the existing services that have covered his needs for years. This made it all the more important for POST Telecom to be able to provide an answer with its managed services offering not only to new customer needs, but also to important existing ones. This is exactly the answer it found in CTModule’s Callisto platform.

On the Callisto platform, the desired solution – a selection of 50 modules – is available right from the start. The end customer thus has exactly what he needs – no more and no less. The definitive answer to all additional individual customer requirements is Callisto’s “Open Applications Management” concept: With CTModule’s own development system, customer-specific solutions can be added to the Callisto platform in the shortest possible time and at runtime. Enterprise customers thus benefit from a tailor-made solution at an attractive price. This was the decisive point for the success of this solution in many POST Luxembourg customer projects.


Based on Callisto’s “Open Applications Management” concept, CTModule has already developed numerous individual, customized applications on behalf of POST Telecom for very specific requirements. POST Telecom was able to convince its customers with an exact, tailor-made product in each case – completely according to their wishes. Requirements come from a wide variety of areas: Call centers, operator stations, services, billing systems, alarm systems, hotel management and many more.

The system rented by the customer from POST-Telecom-Service should appear to him as if it were all of a piece. This strengthens POST Telecom’s competence image to the customer. Callisto is therefore offered by POST Telecom as an OEM product under its own label, with PTL’s own web interface. Numerous Unified Communications Manager configurations or settings on the end device can be made via Callisto’s interfaces. The all-in-one concept of the Callisto platform therefore makes it possible for POST Telecom to offer its customers a complete service from a single source, making it easier for them to decide to outsource their communications infrastructure.

In addition, by integrating the mobile network into the POST infrastructure, a highly professional FMC solution could be developed specifically for the Luxembourg market. This solution supports additional functions on the mobile device, without additional clients, up to the integration into the COC operator solution.

About POST Luxembourg

POST Telecom is part of POST Luxembourg. This was founded in 1842 and is one of the most renowned telecommunications companies in Europe. POST Luxembourg is dedicated to providing innovative global telecommunications, information technology and digital media services, as well as high-performance national and international infrastructures.

With 4,697 employees working for the company and its subsidiaries in 2020, POST Luxembourg Group is one of the largest employers in the country. With its reputation and Luxembourgish roots, POST is also an innovative company that is open to the world through its constantly evolving activities and the diversity of its employees, with more than 50 nationalities.


POST Luxembourg chose the Callisto application platform from CTModule for the following reasons:

  • The user interfaces of the Callisto platform are intuitive to use.
    to operate. This simplifies the post-sales service at POST
  • CTModule offers planning and investment protection.
  • Callisto offers the added value that enterprise customers need.
  • The modularity, the numerous available applications and the low resource requirements of the Callisto platform help to save costs.
  • The complete integration and the POST Telecom branding
    make the solution appear to the end customer as a complete,
    professional overall package for the end customer
  • The high-quality managed service solution requires little maintenance
  • Experienced, innovative and agile partner



Patrick Berg,
Strategic Partner Manager

“Working with CTModule allowed us to create unique selling points with respect to Cisco’s UCM(E) solution. The rich feature set provided via Callisto/VAS made it easy for our customer to adhere to our services.”


Frank Weiler

“All in all, working with a human-sized company enabled us to quickly react to market demands while being able to cope with all imaginable customer requirements. CTModule’s Callisto/VAS plays a major role in the successful proposal of our Managed/centralized Services portfolio.”


  • POST Telecom and CTModule have been working together successfully since 2009.

  • POST Telecom offers its customers telecommunications solutions from a single source.

  • A clear concept, the right solution, clean planning and consistent implementation were key success factors for the introduction of POST Telecom's managed services offering.

  • Custom applications in addition to standard applications is the key to success.

  • A single solution provider with one plaform (Callisto) that includes all value-added applications requested in the market leads to lower total cost of ownership for both POST Telecom and its customers.

A selection of the selected modules