JIGASI_PORT_MIN and JIGASI_PORT_MAX are useless?

hi,

in jitsi docker project, in jigasi.yml (docker-compose file) and env.example we have JIGASI_PORT_MIN and JIGASI_PORT_MAX. it said these are for media!
i am using jigasi for calling and transcription and i did not set these variables and don’t open these ports in my docker-compose and everything works!

can anyone explain what exactly are these ports?
thanks