A system for routing SMS-messages to a plurality of short message service centers, comprising: a first transceiver for sending and receiving SMS-messages over a fixed network; a router table for identifying from a recipient address of a SMS-message a short message service center that services the intended recipient of the SMS-message, said first transceiver cooperating with the router table in order to submit a received SMS-message to an identified short message service center servicing the intended recipient. The system further comprises a GSM-node comprising a second transceiver for sending and receiving SMS-messages to and from a GSM-network, said second transceiver connected to said first transceiver; wherein said first transceiver and said GSM-node are connected and wherein said first transceiver is adapted to submit a SMS-message to said GSM-node when the short message is of a predetermined format, so that the GSM-node forms a proxy connected to the GSM-network.