I love this line- it perfectly sums up the crux of your argument and helps people understand exactly what the problem is and how it’s being solved. I would put this sentence first in this article because until I read it I was unclear on what the problem even was. I also don’t know what PBX means but I’ve since Googled it and understand what you’re saying. Great article- let me know if I can help! I’m free to give you some feedback whenever you need it!