For U1900, you need to follow a certain sequence to configure the outgoing call process using CLI. Which of the following configuration sequences are correct? (Multiple Choice)

Question

Options

• AOffice route selection code -> Office route -> Trunk -> Prefix
• BOffice route selection code -> Trunk -> Office route -> Prefix
• COffice route selection code -> Prefix -> Office route -> Trunk
• DOffice route selection code -> Trunk -> Prefix-> Office route

• A
  78% (29)
• B
  8% (3)
• D
  14% (5)

Explanation

On the Huawei U1900, the outgoing call process follows a dependency chain where the Office route selection code is always the starting anchor (it triggers the routing decision), and the Trunk must always come after the Office route because trunks are members of office routes - not the other way around. Both A and C satisfy this rule: in A the Prefix is applied post-trunk, and in C the Prefix is applied before route selection, both of which are valid configuration paths the U1900 supports.

Option B is wrong because it places Trunk before Office route (Trunk -> Office route), which breaks the dependency - you cannot assign a trunk before the route that will contain it is established.

Option D is wrong for the same reason: it puts Office route last (Trunk -> Prefix -> Office route), meaning the trunk is referenced before the route exists, and prefix manipulation is applied before routing has even been selected.

Memory tip: Use the rule "Route before Trunk, Code comes first" - the selection code is always first (it's the dial trigger), Office route must precede Trunk always, and Prefix is the flexible wildcard that can slot in before the route or after the trunk. Any answer that puts Trunk before Office route is automatically wrong.

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