How to trace an unavailable call

The location of a cell phone caller is equally easy to trace, thanks to a order by the Federal Communications Commission that requires cell phone networks to feature location-tracking technology such as GPS chips to assist services. These days, if you really want to give our minute man Jack Bauer the runaround, give your bad guy a stolen cell phone, or better yet, a one-time-use "drop phone" available at your nearest Walmart and put him on the road.

Continue Reading Below. The CallTraceViewer application requires the. NET 4. This can be obtained directly from Microsoft. CallTraceViewer will run in 32bit or 64bit mode depending on the operating system of the machine it's run on. CallTraceViewer is completely self-contained. Note that most views of the call trace have context-sensitive menus which are accessed with the right mouse button.

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For example, when a call is selected and the call flow graph is visible, the context menu looks like this see the block highlighted in orange below :. Different tabs will have different context menus available. See the documentation section for a particular tab to see which options are available. In all cases, the call reference list will be populated with a list of calls found in the files. This may take a few seconds depending on how many calls are in the trace files. As implied, it is possible to use the first two options in the list to open multiple files simultaneously.

The call reference list contains a list of all calls detected in the log file. Selecting a call will cause that call's data either the call flow graph or the text of the call trace depending on which tab is selected to be displayed. IMG call references are in the format xx:yyyyy:zz where xx is the node ID ie. The call reference list only lists the node ID and call identifier since the call flow graph and single call trace will display data for both call legs.

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If you have a partial call reference then the list can be filtered by entering the partial call reference into the box at the bottom labelled "Filter the list The list will turn green and will display a count of matches in the top right corner if there are matches. The list will turn red if there are no matches. The default view when a call is selected from the call reference list is the call flow graph.

This displays a view similar to Wireshark's call graph showing the protocol messages to and from the IMG.

The arrow colour indicates the protocol. Each line is time-stamped to show the time from the IMG when the message was sent or received. If the trace file contained sufficient debug information then each protocol message for example, "INVITE" or " Trying" will be a clickable link which will load a pop-up window showing the decoded contents of the message. There is an example of this below for the " Trying" message:. The pop-up window can be closed by clicking the red X in the corner or by clicking on another protocol message.

Note that this feature obviously requires that the raw message data be present in the trace file. Austin University in Texas. Skip to main content. Number 1. Call Control 1. Lite Smart Call Handler 1. Resources 1 Android Market: Apps. About the Author Maya Walker began writing professionally in

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