| 摘要 |
<p>A wireless communications system, such as a GSM/PCS 1900 wireless communications system, is connected to a digital network, such as the integrated services digital network (ISDN) through one or more trunks. The trunks have one or more information transfer capabilities, such as unrestricted 64 kbps data transfer rate typical in European markets or restricted data transfer rates of less than 64 kbps which can be found in North American markets. Terminal equipment, such as mobile stations, in the wireless communications system requests either restricted digital information (RDI) services or unrestricted digital information services (UDI). An interworking function unit (IWF) in a Mobile service center (MSSC) of the wireless communications system determines the transfer capability of the one or more available trunks, and maps signaling messages between the wireless communication system and the digital network in response to the transfer capability of the one or more available trunks and in response to whether an RDI or a UDI service is requested by the terminal equipment.</p> |
