I've been researching this for a few days and haven't been able to find a satisfactory answer so here goes. What exactly IS and IS NOT encrypted when using teamspeak3? I understand that public key cryptography is in use to uniquely identify users but is that public/private key also used to encrypt any of the following?

Text chatting in a channel?
Private person-to-person text chats?
File uploads and downloads from the file vault? (cool feature)
VOICE - (I know this is encrypted, and have enabled the specific checkbox)

I'd greatly appreciate an answer if anyone knows. Thanks in advance