Your freespeech extension is configured with voicemail active by default.
Your voicemail will be conveniently sent to the email address you provided as an attachment.
You may want to customise your messages or settings. This can be done in the VoIP line Control Panel which you can access by clicking on the Service menu at the top of the page. See fig below
Tip: You can dial 1744 to test your voicemail - this is also a handy feature if you want a message file for upload and do not have a mic.
Fig. Configuring Voicemail