Thank goodness that poor DR. is dead.  His estate should sue all you people for defamation.  
That said,  today this is a local broadband number made available by AT&T or DISH when routing PC calls that are made from the Verizon communications network. One of your friends or relatives has verizon or dish cable communications and tried to call you from their computer. In some cases, your caller was probably unaware that the call had been connected, and was trying to figure out how to use the microphone, or had their speakers turned down too low to hear you answer.  I put down fax machine because this is new technology and not many folks know about it.

Received this call from "Privacy Manager" id'd with the phone # above.

I got a call from  214-220-3821 early one morning   wanting me to accept   charges from someone calling from this number.  Calls from jails  for example where you can make calls out but  can't  rec.  calls  charge a fee and  are all lumped together under 1 common number from a cell block .  A   person in the know said jailbirds with nothing  better else  to do like to play on the phone  in the  Seagoville  jail.

These calls have been coming
to my number since last year. March 25,2012 until April 5, 2012 they are calling all the time. Caller ID says Private, Unknown Name These calls come in back to back after hanging up. Called 20 times before I left phone off hook. As soon as I hangup phone they continue to call back. These calls seem to be a sex chat line.

got a call saying he is a locator for the DA'soffice he was looking for my brother.