How the player hear coach's message

Hi, folks! I want to send messages from the coach to all the players. I read the coach’s section of the manual and saw that exists a method called dosayfreeform to send messages from the coach and I understood that it sends messages to the players, but I couldn’t find how the players listen to messages in the manual. Thanks!

Players receive messages from the coach as aural sensor information.
Please see the section 4.3.1. Aural Sensor Model
If coaches send a message, players will receive a hear message with the sender name ‘online_coach_{left,right}’.

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