| 摘要 |
In a method for exchanging packets of user data between a terminal ( 4 a, 4 b) of a first network ( 1 ) and a service provider ( 5 a , 5 b) of a second network ( 2 ), the first network ( 1 ) is connected to the second network ( 2 ) by a gateway ( 3 ) which has a unique connection ( 6 a , 6 b) to the service provider ( 5 a , 5 b), the terminal ( 4 a , 4 b) has a first address which is unique within the first network ( 1 ), and the terminal ( 4 a , 4 b) is configurable with a second address which uniquely identifies a particular service from the service provider ( 5 a , 5 b) and which is unique within the second network ( 2 ), the method comprising the steps of: allocating the first address being unique within the first network ( 1 ) to the terminal ( 4 a , 4 b), sending a first packet of user data containing the first and second address from the terminal ( 4 a , 4 b) to the service provider ( 5 a , 5 b) which identifies the first packet by the presence of the second address and extracts the first address from the first packet, and sending a second packet of user data containing the first address from the service provider ( 5 a , 5 b) to the terminal ( 4 a , 4 b) which identifies the second packet by the presence of the first address.
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