Method of detecting cut-off calls in a switching system

A method of detecting cut-off calls in a switching system, comprising;

• recording data corresponding to connection of a call in a control memory in a switch device and within an internal memory in a switch control processor based on a call connection request, said call connection data including control data for performing the call connection request;
• determining, in response to a call release request, whether current data including control data recorded in a location of the control memory used to store the call connection data at the time of connecting the call is identical to the data including the control data which was recorded in the internal memory of the switch control processor at the time of connecting the call;
• and
• if the data are not identical, notifying an operator that a cut-off call has occurred.

A method for detecting cut-off calls in a switching system, comprising:

• storing data corresponding to connection of a call in a first memory, said call connection data including control information required for establishing the connection of the call;
• detecting a change in said call connection data stored in the first memory;
• and determining that the call has been cut-off based on said detected change,
• wherein said detecting includes:
• storing said call connection data in a second memory;
• comparing current data including control information stored in the first memory and corresponding to connection of the call with said call connection data including the control information stored in the second memory;
• and
• detecting that a change in said call connection data has occurred based on results of said comparing.

A system for detecting cut-off calls in a switching system, comprising:

• a call switching unit having a first memory, said first memory storing data corresponding to connection of a call, said call connection data including control memory address and control memory data for performing the call connection request;
• and
• a controller which detects a change in said call connection data stored in said first memory, and determines that the call has been cut-off based on said detected change,
• wherein the controller stores said call connection data in a second memory, compares current data including control memory address and control memory data stored in said first memory and corresponding to connection of the call with said call connection data including the control memory address and the control memory data stored in the second memory, and detects that a change in said call connection data has occurred based on said comparison.