In order to authenticate a caller, a callee generates a code, such as, an alphanumeric code that is sent to a code manager via an electronic communication channel. The generated code is for authenticating a caller in a communication session to be made by the caller to the callee. The code manager stores the code in a memory. After the communication session has been initiated from the caller to the callee and then established, the code is sent to the callee so the callee can verify the caller is authentic.