The beeping likely indicates your backup battery is reaching its end of life and needs replacing.

The Cyberpower or Epic Neo ESPI Battery backup provides power to PTCI equipment in the event you experience a power outage. These keep vital landline phone services working during power outages in case of emergencies.

La batería de respaldo Cyber o Epic Neo ESPI proporciona energía al equipo de PTCI en caso de que experimente un corte de energía eléctrica, manteniendo los servicios de teléfono de casa en funcionamiento durante emergencias.