After Frontier upgraded my ONT today to the new one to get 500/500 service my security system keypad is showing a communication error where it cannot detect a dual tone. My landlines works fine, but the security system is wired to my landline phone that in emergency would notify central station. But, the keypad is popping up a communication error. What could be the issue here? I thought after they upgraded the equipment and phone service was restored the security system would also come back online. I called and they are sending tech out tomorrow to take a look.
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