Advantage & disadvantage

one general question ,since asterisk is a call manager why it is superior than others call mangers .
& is there any drawbacks of asterisk

I can tell you the only drawback that I had encountered with using asterisk is the ability to configure it. Once I managed to learn how to configure an asterisk system, I have enjoyed using my asterisk system and almost forgot such a drawback until I saw your post. :smiley: