In the H.460 public and private network traversing dual SC networking, the communication between the terminal and Client GK follows the () protocol (Single choice)

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The routing logic flow of outgoing calls in AR router is ()

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At which level are SIP retransmissions and timeouts handled? ()

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Which of the following conference control operations are not supported by the sub conferences of a multi-level conference? () Multiple choice

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Among the following types of boards, the one that can provide the function of connecting the U1960 to the PSTN is () (single choice)

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