The technology comes from the cloud, and we provide the support: We set up your virtual phone system, port your phone numbers, and handle any changes afterward. All you have to do is make calls.
Managed Service
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.
Managed service
Setting up and maintaining a cloud-based phone system requires extensive expertise. While the finished phone system is simple and intuitive for you to use, the setup involves a complex configuration process. Our experts will handle the entire setup for you - quickly, reliably, and tailored to your specific needs.
We're here to support you even after the system goes live. Whether you have new employees, changes to call routing, or need additional features - we'll handle all configurations and adjustments to ensure your phone system is always optimally tailored to your business.
The difference
A cloud phone system can be booked quickly - the effort comes afterwards: call routing, announcements, call queues, new employees, relocations. We take care of all of this for you.
We'll explain user accounts, extensions, and call groups - and what you really need.
We fully configure and test the system before you start using it.
Porting your phone numbers and switching from your old system - with zero downtime.
A dedicated contact person instead of an overseas hotline queue.
New employees, changes to call routing, or additional features: just let us know.
In practical terms, this means: You don't call a provider; you call us - and we know your system inside out.
Pricing
Three packages, each including our managed service: consulting, setup, number porting, configuration, and ongoing support & optimization by oneCorp. You aren't just booking a license; you're getting a fully managed phone system.
Cloud Phone System
8.90 €
per user / month · plus VAT · from 2 users
Getting started: modern telephony without any hardware on-site.
Cloud Phone System + Flat Rate
11.90 €
per user / month · plus VAT · from 2 users
For teams that spend a lot of time on the phone -without watching the clock.
Cloud Phone System + Flat Rate + Meetings
16.90 €
per user / month · plus VAT · from 2 users
Telephony and video conferencing in one - instead of two separate contracts.
All prices exclude statutory VAT. Telephony licenses and managed services are billed separately (Placetel and oneCorp, respectively). Would you like VoIP without our service? Learn more
Number porting
The most common question when switching phone systems: Do we keep our numbers? Yes. We port your entire number block to the new virtual phone system and handle all the paperwork with your current provider.
Extensions, hunt groups, and fax numbers move with you - your customers won't notice a thing.
The new system is set up and tested in advance. The switchover happens at the agreed time - you remain reachable throughout the entire process.
Cancellations, porting requests, deadlines: We coordinate everything with your old provider to ensure nothing falls through the cracks.
Data protection & server location
Phone calls are personal data. That is why your IP telephony doesn't run just anywhere, but in redundant data centers in Germany and Europe - encrypted and in compliance with German data protection laws.
The telephony platform is operated across multiple high-availability data centers in Germany and Europe, with a 99.9% SLA uptime guarantee.
Signaling and voice data are transmitted in encrypted form (SIP over TLS, SRTP), making eavesdropping virtually impossible.
You receive a data processing agreement and a dedicated contact person - no anonymous overseas ticket systems.
Microsoft 365
If your team is already working in Teams, your phone system shouldn't have to be a second window. We link your cloud phone system with Microsoft 365, so incoming and outgoing calls go through your usual business number, directly within Teams.
Your employees can make calls directly from Teams using your business number, without needing any extra software.
We connect HubSpot, Salesforce, or DATEV via the App Store and API, ensuring calls are logged exactly where your data lives.
We handle the integration with Microsoft 365 as part of our managed service, including testing and fine-tuning.
Not using Microsoft 365 yet? We manage that too - see Microsoft 365.
Process & Devices
From the initial conversation to the switchover, it usually takes two to four weeks - most of which is the porting period required by your old provider, not the technology.
How many users, which extensions, which call groups? Usually, one conversation is all it takes.
We set up your call routing, announcements, and queues, and test everything in advance.
We manage the porting process and coordinate the switchover date with you.
We stay with you after the switch: changes, new users, and support are all handled by us.
Compatible devices:
Use cases
A cloud phone system is worth it if you…
Required
Getting started with your new cloud phone system is easy
Knowledge
A cloud phone system - also known as a VoIP or IP phone system - moves your entire business telephony to the internet. Instead of expensive hardware in the server room, the system runs in a European data center. You can make calls from anywhere using a laptop, smartphone, or IP phone, and you pay predictably per user rather than for a rigid system.
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 required. New users, phone numbers, or locations can be added in minutes. oneCorp handles the setup, migration, and maintenance entirely for you as a managed service.
Since the ISDN shutdown, VoIP has become the standard for business telephony. Making the switch is worth it - here are the key differences at a glance:
Personal on-site consultation in Heidelberg, Neckargemünd, and Düsseldorf. Looking for just the technology without ongoing support? Go to the Placetel solution.
Your phone system from nearby: We set it up and provide ongoing support - remotely and on site, with dedicated contacts in two regions. Choose your location:
Within around 50 km of Heidelberg
Heidelberg · Mannheim · Ludwigshafen · Neckargemünd · Weinheim · Schwetzingen · Wiesloch · Walldorf · Sinsheim · Speyer · Eppelheim · Dossenheim · Leimen · Hockenheim · Bensheim
Within around 50 km of Düsseldorf
Düsseldorf · Neuss · Duisburg · Essen · Mülheim an der Ruhr · Oberhausen · Ratingen · Krefeld · Mönchengladbach · Wuppertal · Solingen · Leverkusen · Köln · Hilden · Langenfeld
Connect your files, calendars, contacts, and team collaboration in one secure platform. Access, share, and collaborate on your data from anywhere while keeping full control over your information.
Modern collaboration with Exchange, Teams, SharePoint and Microsoft 365, fully managed by oneCorp.
Complete IT management with proactive support, monitoring, and guaranteed response times.
45 minutes, one clear result: at a glance you'll see how well your IT is set up for backup, updates and access protection -
no obligation and no jargon.
Ihr persönlicher Ansprechpartner Your personal contact
Tristan Fischer
Geschäftsführer bei oneCorp Managing Director at oneCorp
Fragen zur VoIP Cloud-Telefonanlage? Ich kläre mit Ihnen Unternehmensgröße, Anforderungen und passende Funktionen - unverbindlich. Questions about a VoIP cloud phone system? I'll help you determine your company size, requirements, and the right features - no obligation.
Ansprechpartner
Tristan Fischer
