About number change for the U1900, which of the following statements are CORRECT?

Question

Options

• ANumber change is available only for the called numbers.
• BA number change rule is bound to an office route selection code.
• CA number change rule is bound to a prefix.
• DThe long number and short number service is lower than number change.

• A
  7% (2)
• B
  4% (1)
• C
  75% (21)
• D
  14% (4)

Explanation

On the Huawei U1900, number change rules are configured by binding them to a prefix - when a dialed number matches that prefix, the system applies the transformation rule, making C the correct statement.

Option A is wrong because number change applies to both calling (originating) and called (destination) numbers, not exclusively to called numbers. Option B is wrong because number change rules are bound to prefixes, not to office route selection codes, which are a separate routing configuration element. Option D is wrong because the long number/short number service actually has higher priority than number change, not lower - the statement reverses the actual priority order.

Memory tip: Think "P for Prefix, P for Pattern-matching" - just like a dial plan, the system needs a number pattern (prefix) to know when to apply a change rule. If you see "route code" or "only called" in an answer, those are traps that confuse number change with other U1900 features.

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