Central SIP Trunk for Carriers
CNT Carrier Trunk provides telecommunications providers, carriers, and service providers with a centralized wholesale trunk for high-quality voice services. It is designed for providers that want to offer their own communications services in the German market and connect their platform centrally to CNT. The same technical connection can also be used to add coverage for international end customers in additional markets.
Centralized Connectivity for Carrier Voice Services
CNT Carrier Trunk reduces technical and operational complexity in carrier environments. Carriers connect their platform centrally to CNT and gain a stable foundation for their own voice services, local phone numbers, and end-customer coverage. Its value lies not only in the reliable connection to CNT, but also in the ability to serve international customers through the same trunk.
Additional markets can be added on the same technical foundation as needed, without changing the carrier’s central connection. Availability and scope of service depend on the local conditions in the respective country.
Carrier-Grade Availability and Operational Reliability
CNT Carrier Trunk is based on a carrier infrastructure designed for availability, stability, and scalable voice traffic. Redundant systems, established interconnects, and continuous monitoring provide a reliable foundation for operating telecommunications offerings. This enables carriers to provide dependable voice communications to their customers while benefiting from CNT’s experience in international carrier operations.
Number Management
CNT supports carriers with number porting and number allocation in Germany and other connected markets. The central processes are coordinated by CNT and implemented market by market, enabling providers to efficiently serve their end customers with local, national, and international phone numbers.
This includes the provision of new number blocks as well as the handling of complex porting and allocation processes. The result is a flexible, scalable offering for number coverage – without requiring carriers to build their own operational structures in every market.
Emergency Calling and Regulatory Interfaces
CNT Carrier Trunk provides the technical foundation for addressing requirements related to emergency calling and Lawful Interception in the connected markets. Emergency calls can be routed on a market-specific basis and transferred to the appropriate emergency authorities with the required information. Statutory interception and disclosure obligations, including Lawful Interception (LI), can be fulfilled through defined technical interfaces and processes in accordance with the applicable local requirements.
Fraud Management and Risk Mitigation
CNT Carrier Trunk is designed for the professional operation of voice services with dynamic traffic patterns. Unusual traffic patterns can be identified, assessed, and addressed operationally through defined processes. Depending on the agreement, suitable measures for monitoring, assessment, and limitation of unusual traffic flows can be incorporated.
This enables carriers to detect fraud risks earlier, limit their impact, and continue operating their own voice services in a controlled manner.
Pre-Rated CDRs for Billing Systems
CNT provides pre-rated Call Detail Records (CDRs) for CNT Carrier Trunk. The call data is already rated based on the agreed wholesale conditions and made available promptly through automated interfaces. Carriers can import the data directly into their billing systems and process it by market, country, and end customer, while retaining their own billing logic.

International Reach Through a Centralized Connection
CNT Carrier Trunk helps carriers expand their own voice services beyond the German market. The carrier’s platform remains centrally connected to CNT, while international end-customer coverage can be handled on the same technical foundation by market and country. This simplifies the expansion of international offerings and creates value that traditional national trunking offerings often cannot provide.
Globally Connected
CNT is registered as a telecommunications provider in 34 countries and connected to the respective telecommunications markets through international carrier interconnects. This foundation supports the provision of local voice services, number allocation and porting, and end-customer coverage in additional markets.
The carrier’s technical connection remains centralized; usage can be structured by market, country, and end customer. Availability, provisioning, and specific service features depend on the local conditions in the respective country.
The following overview shows the current market coverage of CNT Carrier Trunk. Markets listed under “Europe” and “Worldwide” can generally be provided based on established processes. The markets listed under “Additional Countries” require individual review due to local regulatory, technical, or procedural requirements and are typically handled on a project basis.
Europe
Austria +43
Belgium +32
Czech Republic +420
Denmark +45
France +33
Germany +49
Italy +39
The Netherlands +31
Poland +48
Portugal +351
Spain +34
Sweden +46
Switzerland +41
United Kingdom +44
Worldwide
USA +1
Canada +1
Argentina +54
Australia +61
Brazil +55
Hong Kong +852
Japan +81
Mexico +52
New Zealand +64
South Africa +27
Additional Countries
Croatia +385
Cyprus +357
Finland +358
Hungary +36
Ireland +353
Norway +47
Romania +40
Slovakia +421
Slovenia +386
Turkey +90
