Correct, server must respond binary "01" to the router, so that router could start sending GPS data to the server.
You can simulate this communication by launching e.g. "Hercules" application (from HW group) on your server and responding "01" HEX value once IMEI from the router is received:
Additionally, Teltonika has both TCP/UDP listener and Tavl Data Parser applications, which allows you to integrate router's protocols into your server faster. You can download it from here: Teltonika Tavl Parser