abstract:Toll denial or toll restriction is a feature offered by telephone companies which allows a line to be so programmed that it is impossible to originate long distance calls from that line, or to accept charges reversed to the number by other parties. Such lines usually allow calls to be made to no-charge numbers locally and toll-free (in North America, area codes 800, 888, 877 and 866), so customers can still make some long-distance calls.