This article describes which characters are allowed in filename.

Within our control panel it is possible to upload files to use as for example whispersound or announcement sounds. These files have restrictions on which characters can be used in the filename.

Allowed characters include spaces, a to z in lower- and uppercase and the numbers 0 to 9.

In addition we allow the special characters Ä Ö Ü in lower- and uppercase and _.-()