We have a call queue setup. Calls come into our main number and ring first at the front desk. If she doesn't answer, they are routed sequentially to the other numbers.
Recently something changed. Our front desk always had call waiting enabled. If she was on a call, she would see a new call coming in, and she could answer it. Now she does not see the new call coming it, it just routes directly to the next number in the queue.
So basically, we had call waiting in a call queue, but it has been turned off somehow.
How do we turn it back on?