I contacted the staff at the UCSD Alumni Association and they confirmed that their outgoing call center is 858-535-XXXX and that I was on their calling list. I asked to be removed and haven't received a call since.

If you'd like to be removed, their contact information is:
Phone: (858) 534-3900
Toll-Free: (866) UCSD-ALUM
Fax: (858) 534-8976
Email: [email protected]
(as per http://alumni.ucsd.edu/s/1170/PageB.aspx?sid=1170&gid=1&pgid=305)