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US 6,337,903 B1Granted
Call setup for prepaid services
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Abstract
The invention relates to the provision of prepaid services for the customers of a telecommunication network operator in a wired and/or mobile telephone network. The invention makes it possible to implement prepaid call services even in countries with a low level of development of telephony. In the procedure of the invention, it is not necessary to identify e.g. DTMF tones, but the normal dialling system can be used to the verification of right of use of the service.
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