Thanks for the reference, that works but it needs to be done for each call -- cumbersome. What I was looking for was a means of using HomePod as a speakerphone when answering or making calls on my MacBook Pro. I tried selecting the HomePod as the Output Device in "System Preferences">"Sound" but that does not work with calls, or at least it did not for me. Ideally, a setting should be able to be selected so the HomePod is the default device for answering or making calls on a MacBook Pro (through your iPhone.)