What different Types of Medias are shown with Get-CsUserSession ?

if you trigger the cmdlet Get-CsUserSession, you get a key called: MediaTypesDescription

 

i would like to know which values could appear here.

Atm i see only:  [RegisterEvent]; [Audio]; [Video]; [Conference]; [IM]

 

are there any other types ?

 

i don't find any documentation/information except this one which is only valid for On-Prem Setups:

https://technet.microsoft.com/en-us/library/gg398589.aspx

 

in addition to that, does anyone know what happens if i execute this cmdlet while a user skype session is active ?  do i get the user session without the EndTime (because the session is still active) or do i see the session entry only whenever the session has been ended by endusers ?

 

thanks