[Serusers] offline users vs. non-existant

Hey everyone, I'm trying to work out how to recognise whether a user is offline or just doesn't exist. I have this snippet of code ... if (!lookup("location")) { <snip> if ((method=="INVITE" || method=="ACK") && t_newtran() ) { t_reply("404", "Not Found"); # Put an entry in the database acc_db_request("404 Not Found","missed_calls"); break; } else { # all other requests to off-line users are simply replied # statelessly and no reports are issued sl_send_reply("404", "Not Found"); break; }; However, I don't think it's right.. as I don't see under what situations I will reach the else statement... No matter whether I call an offline user or a non-existent user I always get a 404 Not Found and an entry is stored in the database... This is not ideal - I'd like to be able to differentiate between an offline and a non-existent user.. Can anyone help me on this please? Many thanks in advance, D ------------------------------------- Dave Bath dave(a)fuuz.com www.fuuz.com 07736 232085 NOTE: The information contained in this email is intended for the named recipients only, it may be privileged and confidential. If you are not the intended recipient, you must not copy distribute or take any action in reliance upon it. No warranties or assurances are made in relation to the safety and content of this email and any attachments. No liability is accepted for any consequences arising from it