Disclosed are an apparatus and method of performing a connection setup between two or more endpoint devices communication over a data network. An example connection setup operation may include receiving an initial command at the at least two endpoint devices, retrieving at least one IP address from a cache file in response to the initial command, assigning a port number to the at least one retrieved IP address based on a common session identifier (ID) shared between the at least two endpoint devices, and listening for a connection communication message on the assigned port number associated with the at least one IP address.