My question involves child support in the State of: Texas

My son's father has been in and out of jail since he was born and has currently been in prison since 2011. When my son was a year we went to court and got paternity established as well as child support and custody. He was in jail when all that happened then he got out and never paid anything and then went to prison. So now he's supposed to get out in 7months, what steps do I take to collect what he owes?