Abstract: The present invention discloses an integrated message system including gateway functions and a method for implementing the same. In the integrated message system, a user is used as a session initiator. The session initiator builds a session for passing voice and text messages through a network medium. In the session, the session initiator is used as a gateway in order to invite other clients in networks to join in the session. Because the session initiator provides other message functions, it accepts connections from the users of other message systems in order to integrate the clients during the session from different instant message systems, IP-based and/or PSTN systems.