Request for a phone number / change requests /entry to the worldwide web directory

To apply for a phone number, use this web form. Please use this form also for the following changes: department, official authorization, room number, telephone number, fax number, cost allocation, deleting entries.

For the worldwide visibility on the web directory you have to fill in this consent form (PDF), otherwise your phone data are not visible from outside the GSI.

Manuals and handbooks

  • Manuals for the various phone models (German only)
  • Quick guide: Table with the most important functions (PDF)
  • Speed dial numbers: Table with speed dial numbers to pre-programmed destinations
  • Paging system (PSA): enter 12, then the PSA-No. and then your own phone number
  • VPN Speed dialing: Accessibility of GSI mobile phones and GSI landline extensions (German only)

Conference calls

On this page you will find detailed instructions for conducting  Conference calls (German only).

The official GSI phone book

Here you will find the interactive  GSI phone book.