so with partner messaging line one can ring all exts but play a different greeting than line 2,and line 2 play a different greeting than line 3 etc. etc. how many lines can be set up to play different greetings at one time. also can these greetings all have sub menus. 1 for ext, 2 for announcement, 3 for return to main menu etc. also does the messaging require a license card, and if so exactly what does the license card do or provide. thanks