[Users] Recursive routes and retcode

Hi, I'd like to recursively strip off digits from the tail of a username (a numeric number in fact) and do a lookup in usrloc until an aor is found or the number underruns a lower bound, like: route[2] { if(lookup("location")) return(2); if(!uri =~ "^sip:[0-9]{6}[0-9]*@") return(3); strip_tail(1); route(2); } route[3] { # check if numeric, then: route(2); if(retcode==1) {...} else if(retcode==2) {...} else if(retcode == 3) {...} # ... } The thing is that it obviously doesn't work (retcode is 1 as soon as one recursion happens) because I can't tell the recursive call to properly return the retcode like "return(route(2))" or "return($?)" or something like that. Any other ideas except using flags or is that the only way to go? Thanks, Andy