3 line dialer - power dialer

It would be nice if we could have a 3 line dialer, that does a round-robin style of calling. 

So when one line is on the call, the others keep calling if their lines have no one pick up. If two calls pick up the second active line is placed on hold.

this video illustrates this

https://www.youtube.com/watch?v=kIer7Y0bRwI