The Ottspott Hangouts Chat bot can be used in any room where you have installed the bot.
To launch a conference call in a room please type : @Ottspott .conference
If you are in direct message with the Ottspott bot type the same command without @Ottspott behind the command ".conference".
Click on "Start The Conference Call".
The call page will open in a Chrome browser tab and you can now speak. If you've never used Chrome to handle calls, you will have to allow the microphone first.