How to get to Cairo Airport from Ramses?

Hi, I'm new here.
I have a question.
Last time, I took bus from airport to bus terminal and from bus terminal, I took another bus to Ramses.
So, I thought it'd be the same, from Ramses, take a bus to bus terminal, right? Just want to make sure of this.
...and do all buses stop at bus terminal? Or I have to take specific bus to get to bus terminal?
Thanks in advance.