. "RNECPs 224 a, 224 b, 902, 904, 906 and 908 are used by soft switches 204 a, 204 b, 204 c, 304 a, 304 b, 304 c, 306 a, 306 b and 306 c to collect generated call events for use in such services as preparation of billing and reporting." . . .