Fixed Phones

This service is responsible for the installation, configuration, operation and maintenance of the fixed line telephone infrastructure and services including telephony clients, the call centers (Fire Brigade, Service Desk, IT Helpdesk) and telephone switchboard.

Fixed telephony softphone clients are provided via CERNphone.

  • CERNphone: new softphone application developed by IT department in the context of the MALT project, as an alternative to current fixed telephony solutions.  

    Users having already a personal or shared number (analogue, IP Alcatel or SfB) are invited to migrate their number to CERNphone. Newcomers should create their CERNphone number (see KB0007095). 

CERNphone can be used from everywhere: your office, from home, on the field, on travel, etc. CERNphone consists of a dedicated SIP backend, configuration and provisioning web interfaces as well as two phone applications:

  • CERNphone mobile: A mobile softphone app for iOS and Android, based on the popular Linphone open source client and customised to CERN needs.
  • CERNphone desktop: A desktop softphone for Windows, macOS and Linux developed at CERN.


Other legacy solutions (being decommissioned):

  • Skype for Business (SfB): deployed at CERN since 2013. In the context of the MALT project, this telephony solution is being replaced by CERNphone. If you are about to create a new phone number, unless you have a justified need for using Skype for Business telephony, you should create it directly on CERNphone (see CERNphone mobile: migration and installation guide). Skype for Business will be shut down and all numbers on Skype for Business will have to migrate to CERNphone by end 2021 / beginning 2022.

  • IP Alcatel phones: deployed between 2006 and 2014. Currently, only people having already an IP Alcatel device can still request for a new phone number. Purchasing new IP Alcatel devices is no longer possible.

  • Analogue phones: obsolete fixed phone technology, deployed until 2009. The replacement of the analogue phones is ongoing, they are not installed or maintained anymore.