3.5.7. Conference Guest Access 
If you are creating a conference, it is possible to provide a link in order to allow any external participant to join your conference. This participants are named "guests" and therefore this link is known as "Guest Access" over the internet.
A guest can join a UC conference via a WebRTC connection using the Guest Access link.
In order to use the Guest Access feature you need to have the WebRTC function configured
in your UC system.
For more information please contact your system administrator.
‣ Parent topic: Section 3.5. Conferences