VicidialNow 1.3 and Call waiting

How can an agent knows how many calls waiting in the line from the interface? I can't see any labels that shows it.
VICIDIAL astGUIclient discussion forum
http://www.vicidial.org/VICIDIALforum/
http://www.vicidial.org/VICIDIALforum/viewtopic.php?f=7&t=11231