For the long number and short number service and number mapping for U1900, which of the following statements is CORRECT?

Question

Options

• ANumber mapping has the highest priority in number conversion.
• BThe long number and short number service takes effect only for the calling numbers.
• CThe number mapping takes effect only for the calling numbers.
• DWhen inner users dial "access code 9" + "called number" to place outgoing calls to the PSTN, the

• A
  9% (3)
• B
  84% (27)
• C
  3% (1)
• D
  3% (1)

Explanation

Option B is correct because in Huawei U1900 systems, the long number/short number (LNSN) service is specifically designed to handle calling-party number conversion - it transforms how the originating caller's number is presented, not the destination (called) number.

Why the distractors are wrong:

• A is incorrect because number mapping does not hold the highest priority in number conversion; the long/short number service and dial rules operate under a defined priority hierarchy where number mapping is not at the top.
• C is incorrect because number mapping actually applies to called numbers (the destination), not calling numbers - this is the opposite of what the LNSN service does, making it easy to confuse the two.
• D is incorrect (though the choice is truncated) - it likely describes an outgoing call scenario with access code 9 that contradicts how U1900 actually processes PSTN egress calls under these rules.

Memory tip: Think of it as a division of labor - LNSN service handles the caller (who's calling), while number mapping handles the called (who's being called). If you remember "Long/Short = Left side of the call = Calling party," you can quickly eliminate C and recall why B is the right answer.

No community discussion yet for this question.