[Serusers] IM problem.

I am trying to implement Messaging from serweb to UA, but not a success. i have this script in my ser.cfg if (!lookup("location")) { if (method == "MESSAGE") { if (!t_newtran()) { sl_reply_error(); break; }; if (m_store("0")) { t_reply("202", "Accepted for Later Delivery"); break; }; }; sl_send_reply("404", "User Not Found !"); break; }; but i read somewhere in google that i need to add in this line. modparam("msilo", "registrar", "sip:registrar@iptel.org") so that the UA will be notify if there is any new message. If i don't add this line, the message can be send from serweb to the account (which stored in SILO) then can be checked from the recipient serweb account. But once i add the registrar line in, the sending process return error code of 405 timeout. can i know whats the problem here? i am using ser-0.9.3 thank you.