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The ITX/TXA messages are used in a Spirou (Signalisation Pour l'Interconnexion des Réseaux Ouverts/Signaling for the Interconnection of Open Networks) network for audio services that are paid for by either a flat rate calculation or time based calculation. The calls are routed to the operator, and the operator reports the payment amount with the ITX message. An example of this functionality would be a customer calling a weather forecast service with a fee involved. The call is routed through an operator which would report the payment amount by the ITX messages and the customer would get charged accordingly.
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