I initially started to receive these calls on March 14, 2011 at 12:20am.  I also received calls from this number on March 15, 2011 at 10:37pm, 10:51pm, and 11:07pm.  A call was received again on March 18, 2011 at 10:09pm.  I answered the first call but I heard nothing.  When I dialed the number back, I received a busy signal.  I filed a complaint with the FCC and via the Do-Not-Call Registry and the calls did stop for approximately one month but have since resumed.  I received calls from this number again on May 30, 2011 at 11:54pm, June 1 at 9:20pm, three times on June 3 at 10:34am, 11:37am, and 10:47 pm, and on June 4, 2011, at 12:53am, June 6 at 11:22pm, 11:23pm, and June 7 at 12:10am.  

There is no on-line information for this number so I think it is a "dead or abandoned" call number.  Any suggestions out there would be greatly appreciated.