[Serusers] gateways routing, based on prefix and blocking calls

Hi I am trying to find an easy way to route calls, based on prefix, and also to block others. I have prefixes for my calls routes bound to gateways using lcr Now using the grp table I have 3 types of user Type A = can call Uk (landline)... setflag(50) Type B = can call UK landline AND mobile... setflag(51) Type C = does what he wants... setflag(52) Obviously over time this will get even more complicated, hence the reason for finding a simple way :-) in ser.cfg if the user is of Type A, he should only be able to call 00441X and 00442X if type B he should be able to call 0044X So in ser I am testing something like this if (uri=~"^sip:00.*@*") { if (uri=~"^sip:0044[1-2].*@*") { if isflagset(50) { call route } } if (uri=~"^sip:0044.*@*") { if isflagset(51) { call route } } } Now this is fine for a few different type of customer, and prefixes, but when I have say Type 4 who can call 0091, 0092, 0094, 00880 for example, then its starts to add up in tersm of pain :-) Is there a way of linking customer to package (I guess via grp) and then grp to prefix ---lcr ) Iqbal