Widely used prefixes for selecting outbound rules / providers are no more allowed in V. 15 / 15.5. Why? I mean traditional line prefixes for selecting exclusive outbound routes, found in various PBX brands, like: *81 -- for provider 1, *82 -- for provider 2, *83 -- for provider 3, etc., are no more allowed to be used. Why we need to select prefixes like 91, 92, 93 and similar for the purpose ? The customers and implementers must have the freedom to decide on internal dial plan. Why such stupid restrictions? Whom this is helping and how?