D. Technical Documentation
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centrexx 3 Teams integration
Deutsche Telefon Standard centrexx 3 Teams integration is a bolt-on that supplements the Telephone System service with a Voice over IP (VoIP) interface into Microsoft Phone System. Deutsche Telefon Standard centrexx 3 Teams integration uses Microsoft’s Direct Routing solution to enable PSTN services from within Microsoft Teams.
Using centrexx 3 Teams integration, customers get a true enterprise voice solution, featuring a host of intelligent telephony features provided by the Deutsche Telefon Standard Telephone System, within the familiar Microsoft environment, which can be accessed from any location and any device, enabling better collaboration and improved productivity.

The Microsoft Teams clients are used as softphones connected to the Deutsche Telefon Standard Platform (via the Microsoft Phone System and Direct Routing), which allow users to leverage the enterprise telephony features that comes with centrexx 3 Professional (e.g. Queue and ACD routing, Contact Centre, etc.).
The deployment and configuration of the Microsoft Teams Apps is done from the Microsoft 365 / Office 365 Teams Admin Centre, a familiar interface to most IT Departments, while the integration between the Deutsche Telefon Standard Platform and the Microsoft Phone System is configured via PowerShell, which can be done by your Microsoft Partner.
The required centrexx 3 Professional components to enable this integration with the Deutsche Telefon Standard Telephone System can be ordered via a separate order form from Deutsche Telefon Standard.
Prerequisites
To activate the Deutsche Telefon Standard centrexx 3 Teams integration bolt-on, the following prerequisites must be met:
- The customer must have an existing Deutsche Telefon Standard Telephone System Contract;
- The customer must have a Microsoft Office 365 Tenant and the appropriate licenses that are required for the use of Microsoft Phone System;
- All technical requirements according to Microsoft's current specifications and recommendations must be met, including ensuring that a reliable Internet connection with the appropriate bandwidth (e.g. for VoIP, HD video) is available
- The installation of the Microsoft Teams Client on users’ computer requires admin permissions onto the local PC;
- Microsoft Terms of Service must be accepted during the client installation.
Technical requirements
The minimum requirements for installing and using the Microsoft Teams App are available on the Microsoft web site.
In your Office 365 tenant, an additional domain must be added in order to interconnect with Deutsche Telefon Standard multi-tenant session border controller. The details for this domain will be provided upon acceptance of the order by Deutsche Telefon Standard.
Note that the activation of this domain requires a valid Office 365 license:
- E1 minimum for Office 365 Enterprise customers
- F1 minimum for Office 365 Education customers
- Microsoft 365 Business for business customers
Existing Deutsche Telefon Standard plan
centrexx 3 Teams integration can only be used as an add-on to an Deutsche Telefon Standard centrexx 3 Professional Phone Extension. The bolt-on acts as a device onto a Phone Extension.
Office 365 Tenant Licenses
In order to be able to use Microsoft Teams with the Deutsche Telefon Standard Cloud Telephone System, one of the following Microsoft license is required for each user:
- Office 365 E1, E3, A1 or A3 + telephone system or
- Microsoft 365 E3 or A3 + telephone system or
- Office 365 E5 or Office 365 A5 or
- Microsoft 365 E5 or Microsoft 365 A5 or Microsoft F3
- Office 365 Business Essentials, Office 365 Business Premium or Microsoft 365 Basic or Microsoft Business Standard or Microsoft 365 Business Premium + Microsoft 365 Business Voice - without call plan (direct routing)
The information printed above is correct as of December 2019. For more information, please visit Microsoft website, or contact your Microsoft Partner.
FQDN-Domain license required
Attention for the FQDN domain registration "KXXXX-01.customers.teams-pbx.cloud" you still need at least one E1 license on top.
Documentation for Technical User/Administrators
The setup of Deutsche Telefon Standard centrexx 3 Team integration is identical to the setup of NFON integration for Microsoft Teams.