Alarm Panel Restoral Codes Being Lost

I have been working on an issue that has been plaguing us for over a year now. Everyone so often we have alarms that don't restore after a panel has been disarmed. In our monitoring software (CCURE 9000) the point shows active but on site, it is closed. It is causing some issues for our monitoring staff and I have been tasked to look into it more. We are not sure where the restoral codes are going missing but the Sur-Guard System I Receiver never gets them as we have used the debug logs to check. Is there a tool to monitor the phone line at the remote site as well as the head end locations to see where the signal is going missing. Thanks.

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