Correct. That will set you Quadnet login as well as the hot-spot/repeater callsign.
Glad you got it working! I like this mode with my 4100 in my car. Even traveling around in the desert with all of the cellular dead spots I can end up driving through, I stay connected to DSTAR2 or QNET20 C and the conversation comes back as soon as I exit the dead spot.
It seems like the only problem I'm having is that when my mobile cold boots, I sometimes won't connect to QuadNet right away. I may have to do an "????? RX" once or twice to get the system properly initialized. I though the changes to the *.service scripts would fix that, but I still have something to learn here.