Origin Based Rating (OBR) requires voice operators to be able to take account of not only the B-Number (Destination Number) but also the A-Number (Calling Line Identity/CLI- which defines the Origin Country) when rating and routing calls.
OBR is increasingly prevalent in the market with more and more Mobile Network Operators (MNOs) imposing OBR based rates for termination.
Typically in OBR rate sheets, invalid A-Numbers are charged at the most expensive surcharge rate, which can be over 500 times the standard termination.
A key problem for voice service providers when offering OBR based pricing is therefore the ability to identify calls with ‘Invalid A-Numbers’ and either block them, or charge at the correct rate.