A construction permit is first issued, with the license receiving approval when the station certifies that the permit has been executed (after testing to ensure that all parameters are within allowable tolerances). Once a facility is built and operational, it may be allowed to operate under program test authority until the license is issued (or denied). Where a station is close to an international border, a license may also need to be approved by the foreign country's broadcasting authority for frequency coordination. This is done even if the border is outside of a station's predicted broadcast range, since radio propagation sometimes causes stations to be heard outside their service area.