| 摘要 |
<p>During a telephone or other connection an exchange stores information about charges to be made for that connection. To provide flexible charging the exchange responds to a charge variation request signal (200) to transmit to a party by whom a proposed charge is to be borne a signal requiring acknowledgement (206, 208) and to modify (212, 214) a respective portion of the store contents relating to said connection in progress only if such an acknowledgement is received, so as to vary the charging arrangements, for example to invoke a higher rate of charge, or alternatively to change the party by whom charges are to be borne.</p> |
