Value,Description,Reference
participation,The URI can be used to join the conference,[RFC4575]
streaming,"The URI can be used to access the streamed  
conference data",[RFC4575]
event,"The URI can be used to subscribe to the     
conference event package",[RFC4575]
recording,"The URI can be used to access the recorded  
conference data",[RFC4575]
web-page,"The URI can be used to access a web page   
that contains additional information of
the conference",[RFC4575]
ccmp,"The URI can be used to indicate that the   
conference focus supports CCMP.",[RFC7082]
grouptextchat,"The URI can be used to join a multi-user chat directly 
associated with the conference",[RFC7106]