You can trace a call from the Call Details screen. The trace shows changes of state for the call and events relating to both ends of the call. For example, it indicates button presses on an extension or if a protocol message is sent or received for a trunk channel that is on the call. These events appear for as long as the extension or trunk remains associated with the call. For example, if one extension transfers a call to another, the trace shows the transfer carried out by the first extension and then events relating to the second extension.