Check your backround testing routines. maybe a vendor or someone else changed them to include 45, 30 or 32 in order to troubleshoot a problem and didn't put them back?
Hmm, I was always taught that the system does 'handshakes' during the day, something like every 15 minutes, and if it doesn't see the phone, it will disable the TN. Then you would have to re-eneable the TN in LD 20.
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