Be (someone's) call idiom
If it's your call, it's eventually up to you to make a decision or a choice.
Though the CEO really wants to hire his brother, the selection is not his call but the HR department's call.
We can go wherever you want, either to France or Italy - it's your call.
It's not my call to tell you where you should study. You have to make that decision by yourself.
The verb "be" should be conjugated according to its tense.
This phrase is used to describe something very modern or updated or something that no longer looks like what it's used to.
It has been a long time since I left my high school, and now I have to admit that it's certainly not your father's high school anymore.