One of our clients has used a zoom line for regular conference calls and at some point they got into a weird routine where every other call was on their line and then our line and it is a horrible system with no benefit and only causes confusion.
So I said "why don't we just use your zoom line every call" and he said "well it doesn't have to be a zoom call" BECAUSE THEY DIDN'T KNOW THEIR OWN CONFERENCE LINE WAS ZOOM