Gordon Chang is a writer with a special interest in the far east. I would listen to him all the time on WABC on the John Batchelor show every night while I was cooking. He seemed pretty level headed in his analysis. Writing in the Magazine "The National Interest" he had this to say about Trump's phone call and his relationship with China:
What Trump has done is not “reset” Washington’s relations with China but put them on an entirely new footing. Up to now, Beijing has kept the initiative, and American presidents, especially George W. Bush and Obama, have merely reacted, trying to build friendly relations in spite of increasingly bold Chinese moves. The concept was that Washington had to maintain cooperative ties, increasingly considered an end in itself.
Trump, by seemingly not caring about Beijing’s reaction, has cut China down to size, telling its autocrats he does not fear them.