| 摘要 |
A system ( 100 ) for tracking incoming telephone calls includes a first caller identification decoder ( 166 ) that decodes caller identification data for a first incoming telephone call including a time stamp having a value reflecting a first time. The system ( 100 ) also includes a database ( 170 ) for storing the value of the time stamp, a second caller identification decoder ( 164 ) that decodes caller identification data relating to a second incoming telephone call initiated at a second time and a frequency counter ( 156 ) having a first value at the first time and a second value at the second time. A central processing unit ( 152 ) is operable to retrieve the value of the time stamp, identify the first and second values of the frequency counter and thereby determine the second time. A database ( 170 ) stores a record reflecting the second time for the second incoming telephone call.
|
