As of 1st of May 2018, it will no longer be possible to use the prefix “10”, which could be used to replace the French international code 0033 until now.
Please consult the following web pages for the different modalities of calling:
- For the traditional and IP Alcatel phones: https://information-technology.web.cern.ch/book/fixed-phones/instructions-using-phones-cern-traditional-and-ip-alcatel
- For the Skype for Business (Lync) numbers: https://information-technology.web.cern.ch/book/lync-ip-phone-service/faq#How can I call Geneva, Switzerland or another country