Initial situation
The client operates at about 20 locations throughout Switzerland. The telephone systems at these locations were outdated, consisting of separate PBXs at each site using both analog and digital technology. In addition to standard phones, there were DECT systems, fax machines, intercoms, and door controls connected to the system. There is no integration between the PBXs and the client’s O365 tenant.
Goal
The goal of the project is to replace this existing infrastructure with a solution VoIP 3CX. The key elements were:
- simplify the infrastructure in order to have a centralised management.
- to be able to use IP phones with centralized provisioning.
- to have a softphone application on the PC and on the smartphones.
- to be able to integrate the telephony server with the O365 tenant.
- to integrate faxes, intercoms, door controls.
Concept
During this project, we worked with our client to develop the overall telephony concept for all of its sites (~1,400 users). We redesigned the over dial plan , established network policies to secure the system, and defined DHCP policies for provisioning IP phones.
We have set up a centralized virtual 3CX server integrated with the O365 tenant. This allows us to link phone extensions to users Azure AD ; it also allows us to build an address book based on information from Azure AD and Outlook contacts. An IVR has also been configured for the main number. The 3CX server has been connected to an SIP trunk at a telecommunications provider. The IP phones were automatically provisioned by the 3CX server, and firmware updates are also deployed from the server.
ATA adapters, compatible with 3CX, have been deployed to connect fax machines and other analog devices.
Result
This migration enabled the customer to replace its telephone systems, which were no longer under warranty, with a solution VoIP. The 3CX solution is cost-effective, centralized, and easy to manage. It enables the use of softphones on PCs and smartphones, both from the corporate network and over the Internet. This clearly facilitates working from home, especially during a pandemic.
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