I would try to get the names of the people on the call ahead of time, if possible. If not, I would write them down as they are introduced. Using their names during the conversation would be good.
Also, I would be careful not to interrupt anyone. If you start to talk at the same time, I'd say something like "Excuse me, please go ahead."
Make sure you have no barking dogs, crying babies, ringing cell phones in the background.
Smile & speak clearly -- using good grammar.
Best of luck.