We need a sticky or something for this question. I answer it pretty much every second thread.
Answer: There is but I don’t recommend it. If you go with this approach, MOVI will be eager to match anything uttered in the room to a command. The Callsign has a much stricter match.
Look - Google, Apple, and Amazon don’t do that for a reason. “Okay Google”, “Siri”, “Alexa”. Why do you think you have to wake up those services before asking them to do something?
Apologies if that seems harsh and terse, I only mean to make a point. Companies that are worth many Billions of dollars use a callsign on their devices for a reason. Go with it.