I'm interested in setting up a system which would allow students in my university dorm to communicate to each other freely.
Not sure if we can use existing wifi-routers installed in our hostel ( 2000 sq ft * 3 floors ) ? University imposes a lot of restrictions on usage, so in other case I could by my own router(s) to set up this up because I want to.
Any hints/clues on how to make this happen? Basically it should allow students in our hostel to do voice communication with each other without being connected to internet, just to my/university router.