I have a customer that is evaluating 3CX as a replacement for their current PBX and they have a few specific requirements. 1) In their "off season" they want callers to receive a busy signal when their are no available agents in a queue. During their busy season they have a message and hold music. 2)They have one analog line that they want to ring on all phones and they want a separate "line" button that shows up on all phones. Can a group of lines show up this way?