It's not equal!...In jail, the inmates have a phone on the wall, which they can use anytime to make "collect" calls....they also can have their family set up a service for these phone calls via the jail....
Deafies cannot use this phone. They have to wait until the jailor will take them to another room that has a TTD phone....and good luck! hopefully it's working...(as it wasn't in Duval County)....and the inmate has to wait and wait until a jailor decides or "feels" like taking them to use the TDD phone.
I'm not sure about prisons, but I'm sure there is a seperate room, just like the jail for deaf prisoners.