UCMA 4 >> initiate calls to 2 people and let them talk to each other

UPDATE ( after some tests  )

I want to initiate calls to Person-A and Person-B and let them have a nice conversation. 

What's the best approach for this solution ? 

1) call to A --> self transfer --> back to back call to between incoming self A  to new call B ?

2) Conference ? seems 2 much work for this task

3) Something else ?

* what is back to back call using 2 idles states ?

 using Lync 2013