I configured the DDI software package on my computer to play an alarm tone if the DDI detected any phone number that I programmed into the software: the cell phone numbers of all the FBI agents I had identified as being in communication with Eric. The software continually scanned the phone numbers being fed to it in the chain of cell site, to scanner, to DDI, to computer. If any of the agents’ cell phones showed up in the Teltec area, my setup would sound the alert.