The number is the Georgia State University Panther Alert system number. If there is a campus-wide emergency or message (school closing for weather), the university uses this number to contact students. In addition, it contacts those people students requested as contacts (eg-parents, guardians, relatives). Here is the link for the GSU Safety office -
http://tinyurl.com/GSU-emer-proceed
The call is not alumni based or any solicitations. It is a service to students, parents and relatives of a university. Someone signed you up for this service. The phone number for removal is within the GSU Security Department website from the link above.