7 TARs are expressed in US dollars ("USD") where the originating carrier is an American telecommunications carrier and in "Special Drawing Rights" ("SDR") where the originating carrier is a European telecommunications carrier. SDRs reflect the value of a basket of five European currencies. Usually, where the TAR is expressed in USD, settlement between originating, transit and terminating carriers will be in USD; and likewise, for TARs expressed in SDR, settlement will be in SDR.
8 The TAR is expressed as a rate per minute and divisions of the TAR are likewise a rate per minute. That should be understood in all future references to a TAR or a division of a TAR. Further, as I have said, the TAR is a notional charge. It is notional in the sense that, although it forms the basis of the accounting between originating and terminating (and, where applicable, transit) carriers, it does not reflect a charge actually imposed by and paid to the originating carrier. The originating carrier makes outpayments on the basis of the TAR; but it recoups itself, and takes its profit, from payments made to it on other bases.
Audiotext
4 The "audiotext" traffic the subject of these proceedings consisted of calls made by consumers to telephone information services, being typically a "live" call centre or recorded voice service. These audiotext services were charged for on a per minute basis and were generated by audiotext service providers, referred to at times in the evidence as "ISPs". There were two groups of such service providers relevant to the present proceedings. The first, associated with Hugh Chambers, was Interwest Communications International Limited (Interwest), and its associated entities, Global Internet Billing UK (Limited) (GIB) and Interbill International Limited (Interbill) (collectively the Interwest Group). The second, associated with Michael Charlesworth, was MDC (Europe) Limited (MDC), Mediatel Services Pty Limited (Mediatel) and Sound Advertising Limited (Sound Advertising) (collectively the MDC Group).