I am using my apple ID on multiple devices

I am using my apple ID on multiple devices, i.e. 3 iPhones, 4 iPads, MacAir, MacPro etc....Up until today we have been able to use FaceTime on any device to contact each other. Today for some reason we can no longer faceTime each other from any of our devices. For the iPhones the only 2 selections we have chosen are the cell number for the iPhone and our Apple ID. This is the same for our iPads. We are able to iMessage with no problem. These settings have been working for the last several years. Anyone have any suggestions?