15 is the max and 13 is the minimum. Active roster is 12 per game and each team can assign a maximum of 2 players to their D-League team. By the way, there is no such thing as "IR" any more. Each team just declares who will be inactive on game day: so no more making up fake injuries. I'm not sure how many a team can invite to training camp. Seems like the Jazz always have around 18 or so. Assuming Fes signs, I think they'd be up to 17, depending on whether Scheyer is in or out; there have been conflicting reports.
Williams, Price, Gaines, Scheyer?
Bell, Miles, Jeffers, Thompson
AK, Hayward, Evans
Millsap, Jefferson, Nichols
Okur, Elson, Fesenko?
Am I missing anyone?