About PBX

Hello friends of asterisk!

I am totally new in asterisk.
I wonder why people and businesses switch every day more and more to IP PBX and specifically to Asterisk. What are the common things that a traditional pbx has in comparison with asterisk pbx ,and what are the differences???
What are the strong advantages/features to go through with Asterisk??

What is your opinion?

Chris!

really ?

asterisk.org/support

voip-info.org/