Called while I was out, and my recorder picked up just the last phrases of some robo-message ('...this conference'). A similar number one digit lower (925-201-6133) called a week earlier.
The other number (925-201-6133) has lots of complaints. Caller misrepresenting themselves as PG&E on a typical 'lower your energy bills' scam. I guess they just bumped their spoofed number up one digit.
Called again - no message left. It is a shame that when a number is used to bother people like this that it can not be blocked from a main point....like universal blocking.