In the above article we get into the nitty gritty of what 'reasonable' might mean and it's complicated. If you have a court order, it should define how often the non-custodial parent can call. In an ideal state, long distance parents should have as much leeway in contact with their kids as possible, given that in person time can be limited. As you craft your parenting plan, which will be part of your court order, take that into account. Always put the child's wellbeing first, which definitely includes how much contact they have with their parents.