Callisto for Enterprise Customers

Modular, all-in-one application platform for your UCC-Solution

One Solution for All Your Needs!

Here, with us, you will find all the applications you need for your communication processes around your IP PBX infrastructure on a single, modular UCC application platform.
With over 50 different applications on a single platform and the unique ability to add custom applications at runtime, you can cover all your communication needs with a single product. Save massively on costs across all your communication and ITC processes with Callisto now!

As a UCC Enterprise Customer, You Have Come to the Right Place

In addition to existing IP PBX features, do you need additional functionalities and integrations into existing systems to manage your processes ideally?
Do applications such as an operator console, directory service, fax, call center, voice recording, or even an alarm solution or solutions for your business sector need to be added to optimize your workflows?

At CTModule, you are at the right place:
We deliver applications for vertical markets such as Enterprise, Cruise, Healthcare, Hotels, and more, which fit your needs and requirements. Alarm solutions, call center, fax, wake-up calls, or voice recording are just some of the over 50 Modules available on one  UCC application platform: Callisto.

The unique all-in-one Callisto UCC application platform suits every industry and scales from small to large. Flexible, modular, tailor-made, and qualitative; this system serves micro-companies up to large corporations, like finance, industry, commerce, or tourism.

The Unique Callisto Concept

This is why Callisto is the best choice for you


Over 50 UCC applications available on the Callisto Platform for any vertical market. The all-in-one approach helps end customers and partners to massively reduce the return on investment (ROI).


The ability to add, update, upgrade, or replace Modules or Applications at runtime with no service interruption, makes Callisto the world’s most flexible application platform for UCC solutions. Agile, future proof and secure with Callisto.


Callisto’s unique “Open Applications Management” concept enables customers to upload customized applications to the platform. Enterprises benefit from a fulfillment of their needs and System Integrators can serve customers individually.

Green IT

The Callisto platform can handle up to approx. 1,000 parallel calls with 2‑6 GB RAM, 2‑8 CPUs and 80 GB HD. Partners and end customers profit from a high performance at a lower resource usage, enabling environmental benefits.


Easy to install, configure, manage, use and maintain. Simplicity is a common thread throughout the whole Callisto system. Customers benefit from reduced overall product life cycle costs.


Flexibility in the selection of available modules and interoperability with various soft PBX systems. In addition to that, Callisto is suitable for on-site use, in various cloud or managed service models. We grow with your company.


High quality for products and services is in the DNA of our company. 98% of the installations are running error-free since several years, with more than 25,000 satisfied users and more than 15,000 flawless calls per day prove the stability of the Callisto platform. Customer satisfaction is our daily goal.

Problem Solver

The Callisto application platform has an answer to every UCC need in any vertical market. The variety of 50 applications, and the “OAM” concept for tailor-made applications, are providing a solution for every customer UCC problem.


We stand for professional service and best-in-class Support. Competent sales assistance, consulting, training, customer-specific developments and support, are the praised services by our customers. We have been a stable, reliable and professional partner for over 20 years.


What Are You Dreaming Of?

Are you dreaming of covering all your current and future UCC needs around your IP-PBX infrastructure with just one stable and future-proof application platform with standard modules and customized applications while saving massive costs?

Are you missing the one best possible UCC add-on solution in terms of diversity, simplicity, cost efficiency, investment security, flexibility, and reliability to be able to meet the various, individual, or specific UCC challenges in your company?

Then we have the right solution for you!


We Have the Solution to Your Needs

With over 50 different UCC add-on applications, CTModule’s Callisto platform offers you the broadest offering in the industry. All required applications on a single platform, combined with the unique worldwide concept for tailor-made, runtime importable applications, qualify Callisto as the most flexible, powerful, and future-proof UCC multi-talent for specific needs for your IP PBX telephony infrastructure.

Return on investment

… And Much More

But that’s not all: thanks to minimal resource requirements (Small configuration up to 60 parallel calls: 2 GB RAM, 2 CPUs, 80 GB HD), simple installation and operation (all-in-one appliance: import Callisto image, open web browser, license, and start), the consistent implementation of simple processes for administrators and users, coupled with a transparent, fair pricing model enables an extremely fast return on investment (ROI) in just a few months.

The open architecture of the Callisto platform (incl. web services), the individual and modular extensibility, as well as the continuous development of the product in close cooperation with our customers and partners guarantee the security of your investment!

Your Next Steps

Discover all the benefits Callisto can offer your company free of charge. With your system integration partner, quickly determine which modules best suit your market requirements in a 90-day free trial. You don’t commit to anything, and we guide you with our professional support team throughout the trial period.

Bring your enterprise communications to the next level with Callisto.

Speak Toghether

Let’s Talk

We will happily discuss your needs by phone or in a meeting. Let’s discover how the Callisto platform can help you accelerate processes and win customer projects. After the evaluation, you can decide whether we should hold a live demo for you remotely or on-site or if you wish to receive an offer or test delivery through your preferred Partner.

Customer Voices

  • Chris Flowers
    Sr. Project Manager Professional Services

    NTT and CTModule’s teams have collaborated and continue to work
    with end-client Royal Caribbean to implement a Unified Communications solution onboard Royal Caribbean’s fleet of cruise ships. The teams worked together to successfully implement a Cisco Call Manager solution that integrates CTModule’s software onboard. Past and current successful projects include Royal Caribbean’s new-build ship implementations as well as older ships that require refurbishment and custom legacy integrations utilizing CTModule’s software. The solution scales from projects that have included 150 endpoint installations to larger ships with over 5,000 endpoints integrated.

  • Klaus Vollmer
    Director Maritime Solutions
    Lufthansa Industry Solutions

    We appreciate CTModule as a reliable and highly professional partner, with whom we have a very good cooperation for many years. CTModule convinces with its stable, innovative platform, which we have already implemented several times very successfully and to the highest satisfaction of our customers from the cruise industry. We are looking forward to continuing our proven cooperation in the years to come.

  • PG

    Paul Goldbeck
    Director IT / QM

    Callisto Cruise from CTModule is one of the most reliable systems on board. In the luxury segment of the EUROPA, not only the product, but also the support service has to be exceptional. This is 100% guaranteed with CTModule. As a Application Platform, Callisto Cruise takes over Communication and Guest Interaction tasks at EUROPA. In a partnership Hapag-Lloyd Cruises and CTModule, are constantly working on current topics and looking for new, innovative guest solutions and process simplifications. Overall, the use of Callisto Cruise at the EUROPA gives for Guests, Hapag-Lloyd Cruises and CTModule a WIN-WIN-WIN relationship.

  • PB

    Patrick Berg
    Strategic Partner Manager
    POST Luxembourg

    Working with CTModule allowed us to create unique selling points with respect to Cisco’s UCME solution. The rich feature set provided via Callisto Express made it easy for our customer to adhere to our services.
    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. CT Module’s Callisto Express plays a major role in the successful proposal of our Managed Services portfolio.

  • CH

    Christian Heine
    Telekom Deutschland

    Our customers appreciate our UCC Premium offering with Callisto.
    All the functions they need are reliable and easy to use. New applications can be added automatically at any time from the large Callisto modules library. Security is very important to our customers. That’s why all components of the UCC Premium offering have been designed strictly in accordance with GDPR guidelines.

  • SB

    Stephan Biekötter
    Telekom Deutschland

    The Callisto applications work reliably and stable.
    Feature requests are developed, implemented and tested in close cooperation with CTModule. In addition to that, we very much appreciate the professional support which CTModule offers for us and our customers.

  • DW

    David Waltermann
    Telekom Deutschland

    Thanks to Callisto’s all-in-appliance concept, ease of installation, the
    platform’s minimal resource requirements, and DW’s intelligent update/upgrade method, our operations team is saving significant time and costs.

Contact us!

We are happy to assist you

Phone: +41 31 531 11 11