Methods and apparatuses to receive a request from a mobile application identifying a callee and a communication reference, assign a call-in reference to the request, temporarily associate the communication reference and the call-in reference for a period of time, receive a call from a mobile device having the communication reference, authenticate the received call based on the association of the communication reference and the call-in reference, and connect the call to a callee after the call is authenticated. The assigned call-in reference may be randomly selected from a plurality of call-in references of a connection server, in response to the request that is generated when a call button in the mobile application is activated for a connection to the callee.