Actually, I did answer that but I will try to be more clear....
If he contests, you would file motions, set hearings and possibly even have a trial, just as you would if he were NOT an inmate. The only difference, of course, is that he cannot appear in court as the federal system will NOT transport him for a civil matter. However, the court system can set it up to have him appear by phone.
I actually have a case right now where I'm doing this exact thing. I represent a mother and the father is in prison. Every hearing that we have, the judge's assistant sets it up to have the father appear by phone from his prison.
So, the procedure is quite similar to what it would be if he were not incarcerated, the only real difference is the inability to physically appear in court.
Additionally, as I indicated before, you should easily prevail on all issues as he is in no position to really argue for anything.