| 摘要 |
<p>A telephone is provided with dialling means (120) to output a dialled number signal and a route determining means (121, 127) for determining an access code to route the telephone call via a preferred route provided by a service provider. A keypad (122) of the telephone is provided with a key (128) for generating a user intervention to prevent automatic operation of the route determining means to insert an access code so that, in normal use, the user is required only to input the call destination telephone number to achieve optimum routing. The user however has the option of intervening to prevent automatic call routing by actuating a function key of the telephone keypad. Calls routed to a service provider may be authenticated using an authentication procedure in which an authentication data signal is transmitted to the telephone which encrypts the data using an encryption key before returning the encrypted authentication data signal. The telephone is suitable for domestic and business use to provide optimum routing with minimum operator input and automatic authentication without use of PIN numbers.</p> |
