A method for operating a gateway for wireless mobile clients in a messaging system, the messaging system being configured to comprise a plurality of mobile wireless clients (1, 1', 1''), a core messaging system (7) and at least one gateway process or gateway (5, 5', 5'') acting as a proxy on behalf of the clients (1, 1', 1''), the method comprising the step of the gateway (5, 5', 5'') storing a session context (11), which session context (11) comprises the status of a session established between the core messaging system (7) and one of the clients (1, 1', 1''), a state of the client connection associated with the session, and a session identifier which is unique to the session.