I was receiving many calls from a company called "DRG" 856 295 5561. I have a software program on my computer that sends an electronic "do not call" message when recieving any blocked, unknown, unwanted, Private caller, Out of area, etc calls. Records the time and date, caller id, and any message left with a caller id. Then I get a call from Broadwing Communications, Concord Calif. There is a connection

The 925-270 exchange is serviced by the following companies within the CONCORD ratecenter.

BROADWING COMMUNICATINS. LLC - CA
LEVEL 3 COMMUNICATIONS, LLC - CA
ASTOUND BROADBAND, LLC - CA
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA
Calls are routed via OCN 8827 on a Northern Telecom DMS 250 switch located in the Concord, California area.

Received a call today.  No voicemail.  I use an Android so I will send to the reject list so the calls won't come through anymore.  Sorry iPhone users, not an option for you.

iPhone iOS has supported a "block caller" list for many years. I use it often.

Calls evenings no message

left no message. blocked.