Hello I am the new intern at Niagara Technology Group. I have some bare bones knowledge of how computers work and look forward to learning from you all. Most of my knowledge is based in vehicles and some engineering. I was a Go-Kart racer/mechanic for 4 years on a amateur level

I understand that it works based on the user pre-setting its routing, I just want to know a little more in depth on how the routing works.

For this example lets say that you only have one server running one PBX.
If you go in and swap two extensions can the other extensions still receive and make calls?