• Nederlands

Global VoIP

Global VoIP (SIP trunk) stands for one telephony infrastructure, which is realized by combining reliable global telephony providers on one Global VoIP (SIP) platform. Through our Global Connectivity portfolio, we help to create one VoIP (SIP trunk) infrastructure worldwide, which provides a solid reliable foundation that works together with all your favorite applications in the Cloud (such as Microsoft Teams, Google or Salesforce).


One telephony environment for the entire organization

The entire telephony infrastructure from inside and outside the organization can be combined in one telephony environment for all employees.

Integrate VoIP with other Cloud applications

One environment that works with all your favorite applications in the Cloud, such as Microsoft Teams, Salesforce, etc.

Worldwide experience

Each country has its own rules and laws. With our carrier-neutral approach, we combine the VoIP (SIP trunk) solution from multiple tier 1 providers for 1 reliable global solution for flexible usage.


Retention of existing functions

We ensure that the new VoIP (SIP trunk) environment is seamlessly integrated. For instance, with the current service desk, contact center, local telephone exchange or current other systems. This way you migrate at your own pace per department or location.

Worldwide telephone numbers

Optimal accessibility with worldwide available telephone numbers, such as geographic, local, free, or paid service telephone numbers.


Worldwide 911/112 emergency services

Our services can provide 911 reachability worldwide for most countries.

Flexible, future-proof and cost-efficient

Employees can make/receive calls anywhere in the world. At home, at the office or on the road. Always available with predictable costs by following the smartest routes with tariff plans and tailor-made packages.

High availability

By independently combining different carriers and routes, it is possible to create a redundant design with availability of up to 99.999%.

“We make a difference by designing, building and proactively managing all of our flexible, reliable and carrier neutral solutions with our Professional Services.”

Managing Director Horizon
Melvin Jellesma

Our Professional Services

Project & Service management

We are involved from creating to building the design, incl. the transfer to the operate phase in the management organization.

Customer Mission Control Portal

With our Customer Mission Control Portal you retain full insight and control over all your solutions, status and invoicing.

Design & Engineering

Our Engineering professionals realize a design that fits the exact requirements for each solution at any location.

Global Logistics Services

Shipping of hardware components to desired locations, support with customs clearance, import duties, installation, etc.

Global Certified On-site Engineers

Use our engineers for, among other things, fast migrations and support on (remote) sites without local technical personnel.

24x7 Support & Monitoring

Our Global Mission Control Center – 24×7 NOC proactively manages all solutions worldwide (NEN-ISO/IEC 27001:2013).

“Horizon has helped us with a Global VoIP environment. From ISDN to Global VoIP and then to a telephone exchange in the Cloud. Thanks to the flexibility and scalability within the Global VoIP environment, Vertom Shipping is able to facilitate even better and we can respond more quickly to changes such as expansions, acquisitions and downsizing.

IT Manager Vertom Shipping
Patrick Taffijn

Communication solutions


Microsoft Teams

Easily call with Microsoft Teams. We can also integrate Microsoft Teams with our Cloud Telephony solution, providing you with specific telephone exchange functions.


RingCentral Cloud Telephony

Say goodbye to telephone exchanges on location and use one future-proof solution by linking with your favorite Cloud applications for worldwide accessibility of your employees.

We are Horizon

Horizon delivers communications, infrastructure, and security solutions worldwide with 24x7 proactive support and local management. With our independent experts, we work with the world’s best technology partners to connect the needs and aspirations of our customers with flexible and reliable solutions that leverage proven innovations accredited by Gartner®.

Our added values


Independent & Carrier-Neutral


1 Tailored invoice, 1 Contract, 1 Contact, 1 SLA


Global Mission Control Center – 24x7 NOC


Professional Services


Flexible & Scalable tailor-made solutions


'Best-of-breed' technology