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During a power failure, a technician receives several reports via email that the VoIP phones have no display, however the PBX has power and is connected. Which of the following should the technician check to verify the health of the PBX system?

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During a power failure, a technician receives several reports via email that the VoIP phones have no display, however the PBX has power and is connected. Which of the following should the technician check to verify the health of the PBX system?






 
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