In the U1900 series unified gateways, what is the correct statement about the prefix? ()
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The prefix is divided into intra-office prefix and outgoing prefix
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Intra-office prefix refers to the prefix used when dialing between different extensions of the same company
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Since prefix 28 includes prefix 289, the system performs the called number according to the maximum matching principle Analysis, the call with the called number 28901111 should choose prefix 28
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The prefix must correspond to the office route selection code