Crown is a Cloud PBX pioneer offering a complete UCC solution – exclusively for carriers and service providers as a whitelabel platform.
Since 2008, Crown has been developing a true Cloud PBX – specifically designed for medium-sized and large enterprises. The result is a comprehensive solution for UCC (Unified Communications & Collaboration) that delivers a fully integrated approach to modern business communication.
Crown Communications
Sustainable Value Creation
Crown empowers partners to actively shape the transition to cloud communications — with a robust technological foundation, flexible integration options, and long-term scalability.
Market Opportunity and Customer Retention
In most organizations, the shift from traditional PBX systems to cloud-based communications is still ahead. This fundamental transition to Unified Communications as a Service (UCaaS) offers partners the opportunity to position themselves early with a powerful, future-ready solution. Deep integration into existing communication processes strengthens customer retention and forms the foundation for long-term use and sustainable business models.
Technology Independence
Call Manager is deliberately designed to be vendor-neutral, giving partners maximum strategic flexibility. The platform enables the independent creation of branded communications solutions – without being tied to proprietary systems or vendor ecosystems. This enhances technological sovereignty, simplifies long-term planning, and opens the door to custom business models with full control over products and customer relationships.
Standards Compliance and Interoperability
By supporting established protocols such as SIP and OpenID, along with common integration interfaces, Call Manager fits seamlessly into existing infrastructures. The platform ensures high compatibility with third-party applications, endpoints, and networks – even in complex, heterogeneous IT environments. This openness guarantees long-term interoperability and enables smooth integration as requirements evolve.
Hosting, Compliance, and Regulated Markets
Call Manager is operated exclusively in certified data centers in Germany and meets all applicable data protection, information security, and compliance standards under European law. As such, the platform is well-suited for use in regulated industries like finance, healthcare, and public administration – wherever legal compliance, auditability, and technical oversight are top priorities.
Leading Technology
Crown combines the key pillars of modern communication: security, scalability, and flexibility. The platform is precisely tailored to the needs of partners and their enterprise customers—offering robust protection, effortless scalability, and versatile customization for a wide range of use cases.
Selected Partners
Carriers and service providers place their trust in Call Manager and successfully deploy the platform across diverse markets and use cases. The partner solutions presented here demonstrate how seamlessly the whitelabel platform integrates into existing business models and infrastructures—brand-compliant, scalable, and future-proof. Technology partners also rely on Call Manager for their own operations, using it as a foundation to develop closely aligned, proprietary products – underscoring the platform’s technological maturity and integration capabilities.
Carrier in Germany*
Call Manager is a key component of the partner’s comprehensive UCaaS offering for business customers. Fully integrated into internal systems and processes, the platform meets the highest standards for scalability and brand customization—forming the foundation for a powerful communications solution delivered under the partner’s own name.
CNT AG
Call Manager serves as the technological foundation of CNT’s UCaaS solution, tailored specifically to the needs of medium-sized and large enterprises. Through standardized processes and a focused product strategy, CNT has become one of the leading providers in this demanding market segment.
Leading System Integrator in Germany*
With a nationwide network of local offices, the partner is ideally positioned for complex on-site integration projects—such as connecting alarm servers or industry-specific systems in the healthcare sector. Within this environment, Call Manager acts as the central UCaaS component of the solution portfolio, and is used reliably, flexibly, and at scale across a wide variety of customer projects.
Gamma Communications
The Europe-wide carrier has expanded its portfolio with Call Manager—seamlessly integrated into existing operational processes and tailored to complex customer needs. Thanks to the platform’s multi-tenant architecture, Gamma also enables numerous partner companies within its network to offer a high-performance UCaaS solution under their own brand.
Carrier and MVNO in the DACH Region*
The platform serves as the foundation for a full-featured whitelabel offering that the partner continues to develop independently – including custom app solutions built on the API. Deep integration into the mobile ecosystem – including SIM support for mobile users – enables a seamless UCaaS experience across both fixed and mobile networks.
Gigaset
As Europe’s market leader in DECT devices, Gigaset uses Call Manager internally to develop, test, and optimize its own SIP phones – directly at the live interface. The company’s extensive DECT infrastructure at its Bocholt facility was integrated seamlessly and is fully supported.
Snom
The pioneer of SIP telephony chose Call Manager as the foundation for its own Cloud PBX – underscoring its confidence in the platform’s technological maturity. In addition, Snom uses the environment for extensive interoperability testing and deep integrations, ensuring maximum device compatibility in real-world deployment.
Regional Metropolitan Network Operator*
This municipal provider deploys Call Manager under its own brand for businesses and public institutions – offering regional focus, local service, and strong technical expertise. Two additional brands target the SoHo market and a neighboring region, extending the UCaaS reach to a broad and diverse audience.
TKS Telepost Kabel-Service
TKS provides modern communications for approximately 75,000 U.S. military personnel and NATO partners across Europe. Based on Call Manager, the solution underpins secure, high-performance voice services at strategic locations such as Ramstein Air Base and U.S. Army Garrison Wiesbaden – seamlessly integrated into the network infrastructure and designed to meet the highest standards for security, availability, and stability.
* Whitelabel partner not named publicly
Career
Crown develops communication solutions that set new standards – with a team that combines technological excellence, entrepreneurial thinking, and genuine collaboration. We’re looking for people who take ownership, think ahead, and want to help shape the future. All in an environment without rigid hierarchies, but with a strong sense of personal responsibility and room to grow.
“A passion for software engineering matters more to us than experience with any specific technology.”
Working at Crown
Responsibility From Day One
Independent work in small, agile teams – with real impact on product and market.
Technology With Substance
Challenging technologies, high standards: contribute to a platform developed entirely in-house and constantly evolving.
Technical Depth
Challenging tasks in a transforming industry – with room for specialization and fresh perspectives.
Flexible Work Models
Flexible hours, remote work, and a reliable work-life balance – without the endless meeting grind.
Genuine Appreciation
Flat hierarchies, direct communication, and a collaborative culture built on respect and accountability.
Open Positions
Frontend Developer
Design frontend solutions using TypeScript, Angular, and Electron – in the browser and natively on macOS and Windows.
Backend Developer
Implement reactive streams and microservice backends with Java or Scala – using technologies like Hibernate, PostgreSQL, and Netty.
Rust Developer
Build high-performance network services and backend components in Rust – powering a modern communications platform.
We're always happy to receive proactive applications. Please send your full résumé to: jobs@crown.de