This is a phrase I've come across a few times recently in manga.
I'm not familiar with it so I'm not quite sure of it's correct meaning and usage, looking online I've only managed to find a meaning for the phrase: "話を通して" - with the を particle instead of the は - which means to "get it explained to…/run it by…" with the nuance of getting consent from somebody.
How does 話は通してある differ? Does it have a similar or even the same meaning as 話を通して? Or if it 話は通してある has a different meaning completely, will someone kindly explain?