Isn't it more likely that it's a call centre where each operator has multiple outgoing calls on the assumption that they will be on one call (on average) at any

Isn't it more likely that it's a call centre where each operator has multiple outgoing calls on the assumption that they will be on one call (on average) at any given time, but sometimes more than one call might be answered (e.g. they're still talking to another victim when you pick up the phone)?