| 摘要 |
A first server detects a condition that requires a service to be invoked, and the detection of this condition triggers it to establish a connection with a second server. The first server relays data relevant to a first communication between first and second terminals and the second server over the established connection. The first server also relays data relevant to a second communication between the first and second terminals and the second server, or between third and fourth terminals and the second server. Alternatively, the second server both receives and returns the data relevant to the first communication from/to the first server over the established connection.
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