This makes sense. Call went to son's cell for 4 rings AFTER mom got thank you call from CMU alumni association for $30 donation on house phone. Must have noticed same last name and hung up. he only gave $10... :) (we don't have home caller id)
This is the CMU Alumni looking to update info/ask for donations. They use auto-dialers so if you don't answer your number goes back into that rep's list and will dial again.