Which of the following statements are CORRECT about the logical call process on U1900?

Question

Options

• APrefix -> Office route -> Office route selection code -> Trunk
• BPrefix -> Office route selection code -> Trunk -> Office route
• CPrefix -> Office route selection code -> Office route -> Trunk
• DPrefix -> Office route -> Trunk

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

Explanation

Option C is correct because the U1900 processes outbound calls in a hierarchical narrowing sequence: a dialed prefix maps to an office route selection code (a policy that governs how to choose among routes), which then selects a specific office route (a logical group of trunks sharing common attributes), which finally assigns an individual trunk line for the call.

Why the distractors fail:

• A reverses the middle two steps - the office route selection code must come before the office route, since the code is the mechanism that chooses the route.
• B places the trunk before the office route, which is impossible - the trunk is the physical resource within the office route, so the route must be identified first.
• D skips the office route selection code entirely, omitting a required configuration layer; without a selection code, the system has no policy to determine which office route to use.

Memory tip: Think of the sequence as a funnel - Prefix → Selection code → Route → Trunk, or the mnemonic "Please Select Right Trunk." The key rule is code before route, route before trunk - each step narrows the choice until a single physical line is reached.

No community discussion yet for this question.