I will try and keep it sort, my friend and I both do our own homelabs the usual stuff Radarr, Pi-hole, TrueNas, Proxmox etc.
Now we want to do a bit of silly thing as the title says, regards to Fax'ing we just want to be able to do send faxs to eachother (memes, guides etc.)
We both have a cisco SPA2102 VoIP which to our understanding should do the trick.
I have tried to find stuff on the internet to see if I could find a guide or some idea on how to do this in a modern internet method but without luck, so I was hoping to either get a bit of help or straight answer saying "Just use email man"
As someone working with both VoIP and Fax, all I can say is that both are horrible, and expect the worst from each when putting those 2 things together.
Since my work is a large org (they still use fax officially) I mostly work with enterprise software from Cisco, Oracle, etc. so I cannot help here in detail, start learning about SIP (abd RTP if you want to handle calls too) with FreePBX.
There is a Fax plugin for FreePBX: https://github.com/FreePBX/fax but I could not find any documentation so far.
The world would be great if we started developing new digital solutions to analog problems instead of forcing the digital replacement to mimic its analog original