Yes, it’s possible
You need a SIP trunk to connect to and a PBX server. I would also recommend a proxy server to obfuscate your SIP server as it will be constantly attacked.
It doesn’t technically need its own network, but having it on its own VLAN is recommended as you will want to have some QoS policies for the UDP voice traffic otherwise your call audio will be choppy
My friends and I do a bi-weekly anime night where everyone chooses a series and we watch an episode of each; kind of like a curated Toonami block. One of my friends chose the original Urusei Yatsura.
We’re currently on episode 152, with many more remaining.