SyncML is used for synchronizing data of terminal device in wireless and wired environments. In general, synchronization takes place between a terminal device (e.g., a mobile phone) and a server device (e.g., a web server in Internet). However, a SyncML session, which occurs between the terminal and server, is an end-to-end communication. The idea of the present invention is to provide a method, a router and a system to allow routing of the synchronizing data exchanged during a synchronizing session through such a router. In general having the router is more cost efficient and a faster solution from the end-user point of view.