Received upwards of 15 calls a day from this number with a fax tone or silence (both types). Called the nuisance hotline and had a "trap" put on my line to identify these idiots. The minute the trap was activated the calls stopped. Silence finally. Caller ID stated Trunk Group 323. When Verizon called the number, they said it was a disconnected number.
Hang up call received, no message left. One of many of these types. Called the number and the auto attendant stated it was "NBC Universal" although they are closed on Sunday. Obviously, someone is spoofing numbers