We do recommend users using a telephone to join Zoom meetings via dial-in, using any of the local numbers at the Zoom email meeting invitation or at Zoom International Dial-in Numbers or CERN number: +41 22 7673020.
Please also check out Zoom article: Joining a meeting by phone.
Zoom Call-Out feature also known as Call Me, please see Zoom article: Using telephone call-out is only available with a justified request.
In case you would like to use it please send a email to firstname.lastname@example.org, so we can follow-up your request via SNOW ticket. Be aware that cost may be charged to your group/department.