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.

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

Cloud Phone System
+ Flat Rate + Meetings

16,90/ per user, monthly
available from 2 users
Cloud Phone System
150+ telephony features such as BLF, call groups, voicemail, and many more
Premium app for desktop and all mobile devices
Germany flat rate included
AI phone assistants that answer calls & handle customer inquiries (optional)
Call Center Basics
Call queues
Hunt groups
Voice menu (IVR)
Reporting & analytics
Integrations
App store with integrations for MS Teams, HubSpot, Salesforce, DATEV, and more
API access
Meetings & Messaging
Video meetings with up to 1,000 participants
Secure 1:1 or team chats
File sharing, whiteboards & polls
Meeting summaries, translations, transcripts, and more with Webex AI
Inquire now
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?

Find out more here

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

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Bestehender Internetanschluss

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Endgeräte (IP-Telefone, Headsets oder Softphone-Apps)

Headphone icon

Existing phone numbers (optional to port)

Chat message icon

A brief consultation with our team

Rufnummern-PortierungNumber porting

Ihre Rufnummern nehmen Sie mit - ohne AusfallKeep your existing numbers - without downtime

Die häufigste Frage beim Wechsel der Telefonanlage: Bleiben unsere Nummern? Ja. Wir portieren Ihren kompletten Rufnummernblock auf Ihre neue virtuelle Telefonanlage und übernehmen den Papierkram mit Ihrem bisherigen Anbieter.The most common question when switching phone systems: do we keep our numbers? Yes. We port your entire number range to your new virtual phone system and handle the paperwork with your previous provider.

Kompletter RufnummernblockYour entire number range

Durchwahlen, Sammelnummern und Faxnummern wandern mit - Ihre Kunden merken vom Wechsel nichts.Extensions, hunt groups and fax numbers move with you - your customers won't notice the switch.

Umschaltung ohne LückeSwitch-over without a gap

Die neue Anlage wird vorab eingerichtet und getestet. Umgeschaltet wird zum vereinbarten Termin - Sie bleiben durchgehend erreichbar.The new system is set up and tested in advance. We switch over at an agreed time - you stay reachable throughout.

Anbieterwechsel inklusiveProvider change included

Kündigung, Portierungsauftrag, Fristen: Wir stimmen das mit Ihrem alten Anbieter ab, damit nichts zwischen die Stühle fällt.Cancellation, porting order, deadlines: we coordinate with your old provider so nothing falls through the cracks.

Datenschutz & ServerstandortData protection & hosting location

Cloud-Telefonie aus deutschen Rechenzentren - DSGVO-konformCloud telephony from German data centres - GDPR-compliant

Telefonate sind personenbezogene Daten. Deshalb läuft Ihre IP-Telefonie nicht irgendwo, sondern in redundanten Rechenzentren in Deutschland und Europa - verschlüsselt und nach deutschem Datenschutzrecht.Calls are personal data. That's why your IP telephony doesn't run just anywhere, but in redundant data centres in Germany and Europe - encrypted and under German data protection law.

Standort DeutschlandHosted in Germany

Die Telefonie-Plattform wird in mehreren hochverfügbaren Rechenzentren in Deutschland und Europa betrieben - mit 99,9 % SLA-Verfügbarkeit.The telephony platform runs in several high-availability data centres in Germany and Europe - with a 99.9% SLA.

Verschlüsselte VerbindungenEncrypted connections

Signalisierung und Sprachdaten werden verschlüsselt übertragen (SIP over TLS, SRTP) - Mithören wird damit praktisch ausgeschlossen.Signalling and voice data are transmitted encrypted (SIP over TLS, SRTP) - making interception practically impossible.

AVV & klare VerantwortungDPA & clear responsibility

Sie erhalten einen Auftragsverarbeitungsvertrag und einen festen Ansprechpartner - kein anonymes Ticketsystem im Ausland.You get a data processing agreement and a named contact - not an anonymous overseas ticket system.

Microsoft 365Microsoft 365

Telefonieren direkt in Microsoft TeamsMake calls directly in Microsoft Teams

Wenn Ihr Team ohnehin in Teams arbeitet, muss die Telefonanlage kein zweites Fenster sein. Wir koppeln Ihre Cloud-Telefonanlage mit Microsoft 365 - ein- und ausgehende Anrufe laufen über Ihre gewohnte Rufnummer, direkt in Teams.If your team already works in Teams, the phone system shouldn't be a second window. We connect your cloud phone system with Microsoft 365 - inbound and outbound calls run through your usual number, right inside Teams.

Anrufe in Teams statt Extra-AppCalls in Teams, not a separate app

Ihre Mitarbeiter telefonieren aus Teams heraus - mit Ihrer Geschäftsrufnummer, ohne zusätzliches Programm.Your staff make calls from within Teams - with your business number, with no extra software.

Weitere IntegrationenFurther integrations

Über den AppStore und die API binden wir HubSpot, Salesforce oder DATEV an - Anrufe landen dort, wo Ihre Daten liegen.Via the app store and API we connect HubSpot, Salesforce or DATEV - calls end up where your data lives.

Kopplung inklusiveConnection included

Die Anbindung an Microsoft 365 übernehmen wir als Teil des Managed Service - inklusive Test und Nachjustierung.We handle the Microsoft 365 connection as part of the managed service - including testing and fine-tuning.

Sie nutzen Microsoft 365 noch nicht? Wir betreuen auch das - siehe Microsoft 365.Not using Microsoft 365 yet? We look after that too - see Microsoft 365.

Ablauf & EndgeräteProcess & devices

In vier Schritten zu Ihrer neuen TelefonanlageFour steps to your new phone system

Vom ersten Gespräch bis zur Umschaltung vergehen in der Regel zwei bis vier Wochen - der größte Teil davon ist die Portierungsfrist Ihres alten Anbieters, nicht die Technik.From the first conversation to switch-over usually takes two to four weeks - most of that is your old provider's porting notice period, not the technology.

Bedarf klärenClarify requirements

Wie viele Nutzer, welche Durchwahlen, welche Rufgruppen? Ein Gespräch genügt meist.How many users, which extensions, which call groups? One conversation is usually enough.

Anlage einrichtenConfigure the system

Wir bauen Ihre Rufverteilung, Ansagen und Warteschlangen auf und testen alles vorab.We build your call routing, announcements and queues and test everything in advance.

Rufnummern portierenPort the numbers

Wir beauftragen die Portierung und stimmen den Umschalttermin mit Ihnen ab.We order the porting and agree the switch-over date with you.

Umschalten & betreuenSwitch over & support

Nach der Umschaltung bleiben wir dran: Änderungen, neue Nutzer und Support laufen über uns.After switch-over we stay on it: changes, new users and support all run through us.

Passende Endgeräte:Suitable devices:

IP-TischtelefoneIP desk phones DECT für Lager & WerkstattDECT for warehouse & workshop HeadsetsHeadsets Softphone am LaptopSoftphone on the laptop Smartphone-AppSmartphone app KonferenztelefoneConference phones

Vorhandene IP-Telefone können wir in vielen Fällen weiterverwenden - fragen Sie uns einfach.In many cases we can keep using your existing IP phones - just ask us.

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

FAQ - Häufig gestellte Fragen

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.

Ihr AnsprechpartnerYour contact

Tristan Fischer, Geschäftsführer bei oneCorp

Tristan Fischer

Geschäftsführer bei oneCorpManaging Director at oneCorp

Fragen zur Cloud-Telefonanlage? Ich berate Sie zu Tarifen, Rufnummern-Portierung und Einrichtung - unverbindlich.Questions about the cloud phone system? I'll advise you on plans, number porting and setup - no obligation.

Beratung anfragenRequest advice ☎ +49 6223 8009380
Tristan Fischer Fragen zur Telefonanlage?Questions about phone systems?