Calls while attending zoom meeting via mobile app

[LaLa85]

Can anyone help me by answering a question or 2 about making calls while in an active zoom meeting? 
Specifically: My husband was supposedly attending a zoom meeting with (I’m guessing) 20 or so attendees in the meeting. He accesses zoom meetings using his android phone via the mobile app. I got a call from him (while he was in the meeting) that was a “pocket dial”. He didn’t realize the call was made…
My question; is it possible to make calls while attending a zoom meeting? Is there any way he could’ve accidentally added me to the meeting via a phone call unknowingly? 
I heard some things on that call and I really need answers before I make a decision that could result in a drastic outcome. Thank you for your time and help.