I see all the responses here, but I am currently a SFSU student and enployee. This is the generic number that appears when any department from SFSU calls you. It could be the library or the student services building, from my experience. Same number, every time.
Sounds like a scam, since it was telling that it was from SFSU PD and they are trying to find out why a vehicle was seen leaving a scene from a parking lot accident.