VoIP Cloud Phone System for Your Business

A modern VoIP phone system as a fully managed solution from oneCorp
Your cloud phone system – flexible, individually configured, and fully managed and supported by oneCorp.
As a business, you need reliable, scalable, and modern communications – with us at your side, you benefit from our first-class support.
VoIP Cloud-Telefonanlage von oneCorp – flexible Business-Telefonie für Unternehmen

from 6,90 € / per user, monthly

Your cloud phone system – as flexible as you are

Everything from a single source – oneCorp Managed Service

With VoIP from oneCorp, you get a complete solution for your business communications

Consulting & planning of your VoIP solution
Setup & technical implementation
Migration of existing systems
Ongoing operation & support
Continuous optimization

Why choose a managed service from oneCorp?

Setting up and managing a cloud phone system requires in-depth expertise. While the finished phone system is simple and intuitive for you to use, the setup involves a complex configuration process. Our experts handle the entire setup for you – fast, reliable, and tailored to your requirements.

We're there for you after go-live, too. Just as your business evolves, your communication solutions need regular adjustments. Whether it's new employees, changed call routing, or additional features – we take care of every configuration and adjustment so your phone system stays perfectly aligned with your business at all times.

oneCorp Experten richten die Cloud-Telefonanlage als Managed Service ein
Managed VoIP Full-Service von oneCorp für die Business-Telefonie

What is Managed VoIP?

Our strength lies not only in the technology, but in the service.
With our managed VoIP solution, we handle the complete management of your phone system for you.

Our full service at a glance
  • Setup of your cloud phone system
  • Porting of existing phone numbers
  • Configuration of call queues, ring groups & call forwarding
  • Ongoing maintenance & system updates
  • Fast troubleshooting
  • Direct support for your employees
  • Optimization of your business communications
  • Adding and changing user licenses

Managed VoIP Pricing

Included in every plan: oneCorp Managed Service

Consulting, setup, number porting, configuration, ongoing support & optimization are already included. You get a fully managed cloud phone system – not just a license.

Cloud Phone System

6,90/ per user, monthly
available from 2 users
Cloud Phone System
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150+ telephony features such as BLF, call groups, voicemail, and many more
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Premium app for desktop and all mobile devices
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Calls from 1 ct/min
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AI phone assistants that answer calls & handle customer inquiries (optional)
Call Center Basics
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Call queues
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Hunt groups
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Voice menu (IVR)
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Reporting & analytics
Integrations
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App store with integrations for MS Teams, HubSpot, Salesforce, DATEV, and more
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API access
Cloud-Telefonanlage Basis-Tarif von oneCorp
Request a quote

Cloud Phone System
+ Flat Rate + Meetings

16,90/ per user, monthly
available from 2 users
Cloud Phone System
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150+ telephony features such as BLF, call groups, voicemail, and many more
Blue checkbox indicating confirmation.
Premium app for desktop and all mobile devices
Blue checkbox indicating confirmation.
Germany flat rate included
Blue checkbox indicating confirmation.
AI phone assistants that answer calls & handle customer inquiries (optional)
Call Center Basics
Blue checkbox indicating confirmation.
Call queues
Blue checkbox indicating confirmation.
Hunt groups
Blue checkbox indicating confirmation.
Voice menu (IVR)
Blue checkbox indicating confirmation.
Reporting & analytics
Integrations
Blue checkbox indicating confirmation.
App store with integrations for MS Teams, HubSpot, Salesforce, DATEV, and more
Blue checkbox indicating confirmation.
API access
Meetings & Messaging
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Video meetings with up to 1,000 participants
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Secure 1:1 or team chats
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File sharing, whiteboards & polls
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Meeting summaries, translations, transcripts, and more with Webex AI
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All prices exclude the value added tax applicable for the Federal Republic of Germany. The telephony license and the managed service are billed separately (by Placetel and oneCorp respectively).

Looking for VoIP without our managed service?

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When is a VoIP phone system worth it?

A cloud phone system pays off if you...

want to replace your old phone system
need to retire or modernize ISDN
want to connect multiple locations
want to enable remote work or home office
want to lower your phone bills
need a scalable solution that grows with you

What do you need to get started?

Getting started with your new cloud phone system is easy

An existing internet connection
Devices (IP phones, headsets, or softphone apps)
Existing phone numbers (optional to port)
A short call with our team

Cloud phone systems explained simply

A cloud phone system – also called a VoIP or IP phone system – moves your entire business telephony to the internet. Instead of expensive hardware in your server room, the system runs in a German data center. You make calls from anywhere via laptop, smartphone, or IP phone and pay a predictable per-user rate instead of paying for rigid hardware.

How does a VoIP phone system work?

With VoIP (Voice over IP), your calls are transmitted as data packets over your existing internet connection – a separate ISDN or analog line is no longer needed. New users, phone numbers, or locations can be added in minutes. oneCorp handles setup, migration, and maintenance for you as a fully managed service.

The cloud phone system as the ISDN successor

Since the ISDN shutdown, VoIP has become the standard for business telephony. Switching to a cloud phone system pays off – here are the key differences at a glance:

Criterion
Cloud phone system (VoIP)
Legacy ISDN / analog system
Location
Anywhere – office, home office, mobile
Tied to the office location
Scalability
Add users in minutes
Costly hardware expansion
Cost
Predictable per user/month
High upfront cost & maintenance
Maintenance
Included via oneCorp
Your own or external effort
Features
150+ features, updates included
Limited, often outdated

Frequently asked questions about cloud phone systems

What is a cloud phone system?

A cloud phone system no longer sits as hardware in your office; it runs in a data center instead. Calls travel over the internet (VoIP), so you can use the system from anywhere via app, laptop, or IP phone.

How does a VoIP phone system work?

VoIP converts speech into data packets and transmits them over your existing internet connection. A separate ISDN or analog line is no longer required.

How much does a cloud phone system cost?

At oneCorp, plans start at 6,90 € per user, per month (plus VAT), available from 2 users. There are three plans – from the pure cloud phone system, to a version with an all-net flat rate, up to a flat rate including video meetings.

What should a modern phone system be able to do?

Location-independent calling, call forwarding, call queues and voice menus (IVR), integration with tools like MS Teams, HubSpot, or DATEV, easy scalability, and secure operation from German data centers.

What do I need to get started?

An existing internet connection, devices (IP phones, headsets, or a softphone app), and optionally your existing phone numbers to port over. oneCorp handles the entire setup.

Can I keep my existing phone numbers?

Yes. oneCorp handles porting your existing phone numbers – you stay reachable at the numbers you already use.

How does billing work?

Your VoIP solution consists of two separately billed components: the telephony license is provided directly by Placetel, while the managed service (setup, management, and support) is billed by oneCorp. This keeps the license and the service transparently separate.

An image of a person holding phone at the office

Torsten Kaufmann

IT Service Consultant

Just one click away from the future

Get a no-obligation consultation. Together, we'll find the ideal communication solution that fits you and your business perfectly.