| http://www.w3.org/ns/prov#value | - Further objects, features, and advantages of the invention will become apparent upon consideration of the following detailed description in conjunction with the drawing, in which: FIG. 1 is an illustrative embodiment of the invention in block diagram form; FIG. 2 is a more detailed representation of the ring and ringback logic circuit 30 of FIG. 1; FIGS. 3 and 4 represent the output signals of clo
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