Apparently, a virtual army of scammers is using phone numbers registered with bandwidth.com VOIP, masking their identities via exploitation of bandwidth.com's technology (or bandwidth.com is helping facilitate it?). There are plenty of complaints on bandwisth.com's Facebook page, including from the Miami dentist's office whose phone was hijacked thanks to bandwidth.com facilitating anonymous telemarketing/phone scamming: https://www.facebook.com/bandwidth?filter=2
(I particularly like bandwidth.com's generic responses to consumer complaints.)
Bandwidth.com appears to be oblivious to consumer complaints, though fully aware that they are facilitating scammers everywhere.
Threatening phone calls:
According to complaints, this bandwidth.com associated phone number is impersonating law enforcement, the State Attorney General's office, making false claims to people's employers and verbally abusing people over the phone in order to get them to pony up to avoid nonexistent lawsuits: http://whocallsme.com/Phone-Number.aspx/7606248866
I started researching tonight... and why did I do that? We've been getting calls on our land line several times daily for several weeks now. They show up on caller ID as "out of area" (except that they're calling from our area code). I never answer as I don't recognize the number and anyone masking their identity isn't getting the time of day from me, but my husband insists on answering the phone when they call. Whenever he answers, there is no response, just background noise. My husband called the numbers back last night and received messages indicating that the numbers are "not in service." So tonight I looked up two of them. One of the numbers is listed as "unknown in Colorado" even though the caller is calling from my area code. The second one is listed as belonging to bandwidth.com, Colorado Springs, CO: http://www.whitepages.com/phone/1-719-325-8760
I filed a complaint with the FCC this evening: https://esupport.fcc.gov/ccmsforms/form1088.action
I've suggested to anyone registering complaints at the various consumer complaint sites receiving such calls to look up the numbers online thru Reverse Lookup White Pages and then report them to the FCC if being harassed with repeated calls that result in the caller simply hanging up/not responding.
Otherwise, I suggest consumers file a complaint with the FBI if the caller is making suspicious threats of legal action. Local law enforcement may also be contacted. And as this friendly dentist just showed us, contacting the local media is a good way to get the word out in addition to filing a complaint.