HELP FILE
Switch Audio Modes in Session (Classic)
You can switch the audio mode you use to connect to the session while the session is in progress (i.e., switch from Computer/Internet mode to Phone mode or vice versa). This can be useful if you are having issues connecting with your current method.
If you do not see either the Computer audio or Phone call options, then it's possible that the organizer disabled the option for this session. If they used custom audio information, then you will see specific instructions from the organizer instead of the built-in audio options.