(The Yueling channel solution is to use an independent IP channel to provide the t"A ring tone source and playback function. As shown in Figure 1, user A dials user B (registered account_" Yueling service), and calls in from the local terminal office to the sink. Access the office, the circuit switch tandem office or the soft switch selects the MAP (mobile usage part compensation) protocol to access the Subscriber Data Core (SDC) to obtain the Yueling access code signed by the user
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