[Serusers] lookup("...")

Hey Guys (And most likely No girls :( ) I'v got this scenario now : if a user does have voicemail everything is great!. No problems. Thou, my case is that I've got users who does not have a voicemail service, and may disconnect from my gw. Then when a imcoming call coms, the "caller" get's a 404 (per today). So the way I want it to be is : if (!lookup("location"){ (lookup("subscirber"){ log(1,"user's not online but does exist"); sl_send_reply("404", "Not found,but exists"); break; } log(1,"404 , user not found"); sl_send_reply("404","Not found"); break; } If I do it like this,the !lookup("subscriber") will fail, because it cant do this. How can I get this to work ? I see 2 difrent way's of doing it. 1: Create a database with the name users, and dump all my users from this into that database,, then have the same structure etc as I have in the locations database.. .. As far as I see , this will be a ugly hack. 2: make a new function for this .. How and what do you guys mean ? Thanks for a quick answer :) You guys are REALLY helpful both night and day. - Atle