L7-Scvc Call seems to refer to the carrier, not the caller. You see it when you get called by a customer of Layer 7 Hosted VOIP Services (based in San Diego) and they have not bothered to set their own Caller Id information. 86 different pages at 800notes.com refer to them. (VOIP=Voice over Internet Protocol)
They seem to be used by many spammers (or perhaps one robo-dialer with many different spoofed caller-id numbers)
See http://www.l7now.com/hosted-voip.html for details of the carrier. If we all complain to them maybe they will fix their system to make it harder for spammers to spoof caller id number.