| 摘要 |
A federation of multinational PSTN, IP and cellular service providers coordinate their accounting by: populating a subscriber database of subscribers to one number services, a service providers database and a payments clearing database having amounts owed across the service providers based on the individual service provider's portion of pre-agreed payments for services; collecting accounting data from the service providers; updating the relevant databases with the data collected; and providing accounting data to the service providers and subscribers. Voice over IP service is applied to a cellular phone by selecting a compatible codec at peripheral gateways of IP network paths, thereby avoiding transcoding by a connecting multimedia terminal adapter. A portable module, multimedia terminal adapter cellular internet protocol gateway for media communications over an IP network (MTAC IPG) bridges a cellular network, an IP network and a PSTN so that a user may locally dial a cellular phone that is then used to enter the IP network and dial the called party. The MTAC IPG provides gateway functionality and packetizing.
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