We have a repository in the style:

branches/
tags/
trunk/

in the directoy trunk we have the head version. To create a branch for the files in trunk execute:

svn copy trunk branches/asterisk_idefix.fechner.net

Check if everything is fine with:

svn status
A  +   branches/asterisk_idefix.fechner.net

Then commit the changes to the repository:

svn commit -m "Branch for asterisk configuration at host idefix.fechner.net created"