Which component failure would most likely cause loss of ANI service?

Which component failure would most likely cause loss of ANI service?

• A. Loss of the Tandem Switch or Selective Router
• B. Loss of a central office
• C. Isolation of an end office
• D. Loss of the DBMS

Answer: (A)

ANI is provided by the signaling and routing heart of the network that attaches the caller’s number to a call as it moves through the system. The Tandem Switch or Selective Router is the key component that handles long-distance signaling and appends the ANI information to calls across trunks. If that central piece fails, the network can’t supply the caller’s number to the terminating switch, so ANI would be lost network‑wide. Other failures, like a single central office, an isolated end office, or a database management system outage, wouldn’t disrupt the fundamental path the network uses to convey the caller’s number in as broad a way. So, loss of the Tandem Switch or Selective Router is the disruption most likely to eliminate ANI service.

ANI is provided by the signaling and routing heart of the network that attaches the caller’s number to a call as it moves through the system. The Tandem Switch or Selective Router is the key component that handles long-distance signaling and appends the ANI information to calls across trunks. If that central piece fails, the network can’t supply the caller’s number to the terminating switch, so ANI would be lost network‑wide. Other failures, like a single central office, an isolated end office, or a database management system outage, wouldn’t disrupt the fundamental path the network uses to convey the caller’s number in as broad a way. So, loss of the Tandem Switch or Selective Router is the disruption most likely to eliminate ANI service.