Where I come from, this is an easy question, as the consequences for such behavior are incredibly harsh--and justly so. One 911 call means a night in jail for the husband, and the sight police cars essentially means public humiliation in front of one's neighbors. During divorce hearings, any police record of domestic violence typically means the judge will side with the wife when dividing up assets.
Is calling 110 nearly so effective? What about if the husband's mother makes excuses for her son's behavior? Are there any government agencies or social services that can offer counselling or other solutions?