| 摘要 |
A third generation (3G) gateway ( 30 ) provides the facilities for extending a number of internet protocols ( 40, 64, 74, 83, 100, 110, 120 and 130 ) between a second generation (2G) network and a 3G network. The various messages of a session initiation protocol (SIP) are extended to provide user identification and server identification subfields ( 42 ). The SIP message extensions facilitate the communication of 2G and 3G networks for the purposes of implementing push-to-talk and dispatch service features.
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