Based on the provided information, it appears that the caller with the number +18007115551 is likely making automated calls, which are resulting in a loud beeping noise when answered, suggesting a fax machine is on the other end. The fact that the calls are made multiple times in a row, both day and night, indicates a robocall system. This type of calling behavior is often associated with companies or services that rely on automated systems to contact individuals.
I'm receiving an excessive number of calls from this number throughout the day and night
Consecutive calls were made, and upon answering, a loud beeping noise was all that could be heard.