Origination
Origination of a service that is switched in a Class 4 switch or an interexchange switch that performs an equivalent function ends when the transmission enters such switch and termination of such a service begins when the transmission leaves such a switch, except that;
of a service that is switched in a Class 4 switch or an interexchange switch that performs an equivalent function ends when the transmission enters such switch andterminationof such a service begins when the transmission leaves such a switch, except that;