The Pennsylvania Department of Agriculture is urging restaurant owners and staff to be on guard against a potential scam.
The unidentified caller has claimed to be a health inspector and has asked for business information and money.
Agriculture Secretary George Greig said the caller is not a licensed agent of the state or any county.
He also reminded restaurants that inspections by the Agriculture Department's food sanitarians are always unannounced.
Greig said police should be contacted if a restaurant is contacted by someone claiming to be a health inspector who seems suspicious.
He said similar incidents occurred across the state in 2011.