Hi! I've setup an Alcatel 4018 in SIP-Mode to register with FreeSWITCH. The initial registration after startup works fine - the phone sends a REGISTER -> FreeSWITCH answers with 401 -> UA sends REGISTER including authorization-data -> 200 OK But after a while the phone's registration expires, as it sends subsequent REGISTERs _with_ authorization-data right away, which is answered by FreeSWITCH with "481 Call Does Not Exist". I'm not exactly sure if the behaviour of the intitial REGISTER is required(Send authorization-data after 401 has been received) or if the proxy should understand a REGISTER including authorization data. If the latter is true, is there a parameter in FreeSWITCH to allow this behaviour? I've attached traces of both communications, the initial successful registration is "register_alcatel_success.dump", the failed registration is the trace in "register_alcatel_fail.dump" Best regards Christian