It does depend on how you get on with the non resident parent. If you get on well and your child is at that age where they can answer phone themselves etc it wouldnt really matter how often it was.
If you dont get on with non resident parent it is not unreasonable to have hardly any calls especially if dad is seeing child/children in person on a regular basis. Most non resident parents are lucky to get a call a week. Most phone/video calls usually happen in school holidays.