We use vMix call quite often in a session based setup.
were we distribute / reuse vMix call numbers for each session.
in this we can give our client just a few numbers which they can plan / distrubute to callers.

There is a danger though that a user logs in early (often to test his/her setup) and with that "kicking" a on air call.

it would be nice too have a option to give the early login a "please-wait" slide (or something similar) and a operator
a message that someone is calling in. (maybe using the chat function to inform the early caller what's going on)

grt
Maurice