Why does my phone go “dead” during an alarm?

During the brief period of time that your alarm system is transmitting your essential emergency information to the Central Monitoring Station, you will be unable to use the telephone. That is because the alarm system "seizes" the telephone line and preempts normal telephone conversation. Only when all emergency transmissions are complete will your telephone line be released.

It should be noted that the “line seizure” function works every time your alarm system is tripped – even when you test your system – even when reset codes are being transmitted.  Therefore, the more devices you trip during testing, the longer the phone will be inoperable.

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