In U1900 serials unified gateway, which of the following statements about the number change feature are CORRECT?

Question

Options

• AThe maxlen parameter in the prefix indicates the maximum length after number change.
• BThe maxlen parameter in the prefix indicates the maximum length before number change.
• CThe priority of the number change is higher than that of the long and short numbers.
• DThe priority of the number change is higher than that of the number mapping.

• A
  78% (45)
• B
  5% (3)
• C
  14% (8)
• D
  3% (2)

Explanation

In the U1900 unified gateway's number change feature, the maxlen parameter within a prefix definition governs the output - specifically, it caps the maximum length of the number after the change has been applied, which is why A is correct. This makes logical sense because the prefix rule processes the incoming digits and then maxlen constrains the resulting transformed number, not the original input.

Option B is wrong because maxlen applies to the post-change result, not the pre-change input - confusing input vs. output constraints is a common trap on this topic. Option C is incorrect because number change actually has lower priority than long/short number processing; long/short number rules are evaluated first in the processing chain. Option D is incorrect because number mapping holds higher priority than number change, meaning if a number mapping rule matches, it takes precedence before number change logic is applied.

Memory tip: Think of maxlen as the "after" limiter - the number has already changed, and maxlen is the last guard checking the result fits. For priority order, remember: Mapping beats Change, and Long/Short beats Change - number change is the "lowest rung" among these three features.

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