You need to walk a fine line. Once a day to say goodnight is great. But, if he calls while she is playing - ask if she can call back in 30 min or while she is waiting for dinner.
Calls are important, but they don't get to be a leash. You need to balance that while he might have been a different parent before the separation, he may become someone different now and give him the room to do it. You can't complain that he never talked and then complain that he talks too much.