[Serusers] Help with authorization

I have a working 0.9.1 config to which I would like add server side features such as call forward all (cfwdall). I have a pretty good idea how to handle cfwdall using avp_ops however I'm stuck on the authentication. If a subscriber has local calling permissions (acl=local) and cfwdall their phone to a long distance number I need to respond with an informative response. In the INVITE processing in my config I have statements such as: if (is_user_in("credentials", "ld")) { setflag(11); }; These checks fail with the following errors: Apr 21 18:31:53 ser[498]: [SER]: AVP: Checking From gateway caller Apr 21 18:31:53 ser[498]: check_username(): No authorized credentials found (error in scripts) Apr 21 18:31:53 ser[498]: check_username(): Call {www,proxy}_authorize before calling check_* function ! Apr 21 18:31:53 ser[498]: [SER]: Flag for UMVM redirect successful. Apr 21 18:31:53 ser[498]: [SER]: AVP: Checking credentials Apr 21 18:31:53 ser[498]: is_user_in(): No authorized credentials found (error in scripts) I thought adding proxy_authorize("", "subscriber")), check_to and check_from calls prior to the is_user_in check would address these errors but that hasn't worked either. If I want to set a flag if the caller is an authorized subscriber, the callee is an authorized subscriber and then use "is_user_in" to determine if the called party has a particular credential what am I missing? Thanks,Steve