I have been a telecom systems administrator for many years and I find that easy to learn new things on. I can create and route a number anywhere, anyhow, make it ring anywhere or several at once, send a caller to menus or call centers, if an office is closed due to snow, I can route their calls to another location, manage voicemail systems, I can even do wiring... I just don't do NETWORKING, as in routers and switches.
It's related but it's totally different in many ways.