I just replaced a PRI card in a Mitel SX2000 and now I'm getting a "Network Gateway" alarm. As defined by Mitel, "The Network Gateway Security Access Module associated with a legacy ISDN Gateway has been tampered with or has failed." I have never run up against this alarm before. Although I'm showing the PRI circuits as "Idle" and can see calls processing, I am getting reports of calls failing intermittently. Any help would be greatly appreciated.