Is the on-hold music which comes with Asterisk, royalty free?

Can anyone possibly confirm whether or not the music which comes with Asterisk, is royalty free?


The sounds tarballs contain a license file, the text of the license file reads:

These files are distributed under the Creative Commons Attribution-ShareAlike 3.0 license through explicit permission from their authors.

The license can be found at:
CC BY-SA 3.0 Deed | Attribution-ShareAlike 3.0 Unported | Creative Commons

The files were sourced from

Many thanks Malcolm. I’ll check out that license.

Can’t say I understand this one:

But this one seems to confirm that it can be used freely: