Methods are disclosed for providing prepaid telephony service via an Internet protocol (IP) network system. A first method provides controlling at least one media agent or call routing station/switch of an IP network system for allowing and/or blocking call media streams from traversing through the media...http://www.google.fr/patents/US7844039?utm_source=gb-gplus-shareBrevet US7844039 - Methods for providing prepaid telephony service via an internet protocol network system
Methods for providing prepaid telephony service via an internet protocol ...
