| http://www.w3.org/ns/prov#value | - FIG. 11 is a flowchart illustrating a billed number validation process, including an optional free call feature, performed at a billing verification server, such as 365 in FIG. 7 in cooperation with one of IPTS 706-i, such as IPTS 706-1, and other functional units at one or more network nodes such as 725 in FIG. 7.
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