Patent ID: 7440421

Claim:
A method comprising: generating ( 502 ), at a first data-processing system ( 202 ), a call identifier that represents a specific call made from a specific calling terminal, wherein said call identifier is separate from the calling number and the called number of the call; transmitting ( 503 ), to a second data-processing system ( 203 ), said call identifier as part of information related to said call, wherein said call is tandemed out of said first data-processing system ( 202 ) to said second data-processing system ( 203 ); and generating ( 505 ) a first signal at said first data-processing system ( 202 ) to disconnect a first communication channel ( 206 ) associated with said call; wherein generating said first signal occurs after said information related to said call is transmitted; and wherein generating said first signal is based on: i) receiving at least a portion of said information at said first data-processing system ( 202 ) from said second data-processing system ( 203 ) as part of a first incoming call identified by a called number, ii) whether said called number matches a redirecting number known to said first data-processing system ( 202 ), iii) whether an outgoing call to said second data-processing system ( 203 ) exists that is based on a second incoming call having been made to said redirecting number, and iv) whether said call identifier is present in said portion of said information received.