Caller ID says this is "Backbone Community" received a call before 8AM, ignored it so they called a second time and left a message saying "this message is for..." and then disconnected the call.
I got a call from this same number but it was the San Francisco office of the TekSystems employment agency and it was about a job I applied for through their agency.
Same pattern. Called ones, I didn't answer. Then they called back after few seconds. The never left a message. I called back latter on, ansewr machine just saying. "Please dial the extention you want to reach".. weird...
Called and left a message: Populus Group, who appears to be another IT Staffing company like TekSystems. I have no idea if the two companies are affiliated.