@MrMoody - Network architecture diagrams aren’t always pretty to look at either way, in my opinion.
I remember the first time I looked at a VOIP network architecture diagram, back when I was working in the telecommunications industry. You have icons here and there, and then you have this cloud, which is a symbol for the Internet.
Everything feeds into the cloud, where the magic happens, and then winds up on the receiver’s end where voice packets are reassembled and turned into voice calls. It’s somewhat of a loose diagram, but I guess that’s the nature of VOIP technology.