Dozens of daily calls including some at three am.  All calls have three beeps.

we are not a fax

when I answer the phone all it does is beep

Same here the caller ID said ZYLOMED

we have 100's of calls from that number with the beeps every week.

Got calls at 10:27, 10:35, 10:36, 10:50, 11:07 and 11:28. Voicemail msg is three beeps.