300-070 Question #406: Real Exam Question with Answer & Explanation

Question

Options

• AWhen the WAN is down, dial another extension in the office.
• BWhen WAN is down, dial an extension at another site in the network.
• CEstablish a call through the gateway, place it on hold, and retrieve it.
• DEstablish a call through the gateway and drop the WAN link to see if the call is preserved.
• EWhen the WAN is down, place a review local call and long distance call.

Explanation

Validating H.323 call routing in an SRST failover scenario requires establishing a live call through the gateway and then severing the WAN link to confirm the call survives the transition.

Common mistakes.

• A. Dialing an internal extension when the WAN is down tests SRST phone registration and on-net extension routing, not the H.323 gateway's ability to route calls to or through the PSTN.
• B. Inter-site calls require the WAN to reach the remote CUCM cluster; with the WAN down those calls cannot complete, making this test invalid for confirming H.323 gateway functionality.
• C. Placing a call on hold and retrieving it tests supplementary service (hold/resume) signaling, not H.323 call routing continuity during a WAN failover event.
• E. Placing calls when the WAN is already down tests the SRST dial plan entries for local and long distance PSTN access, but it does not validate whether an H.323 call already in progress survives the failover transition.

Concept tested. SRST H.323 gateway failover call preservation

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/srst/configuration/guide/srst/srst-book.html

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