If two IP phones A and B register with the same U1960, which of the following statements is CORRECT?

Question

Options

• AMedia streams of A and B need to pass through U1960.
• BIn a call between IP phones A and B, the flow path for signaling streams is the same as that for
• CIf the U1960 encounters a power outage, the ongoing call (if there is any) between IP phones A
• DIf U1960 encounters a power outage, neither IP phone A nor IP phone B can initiate new calls.

• A
  10% (4)
• B
  3% (1)
• C
  5% (2)
• D
  83% (33)

Explanation

Option D is correct because IP phones rely on the U1960 (a Huawei IP PBX) to handle all call signaling, including registration and call setup. Without the U1960 online, neither phone has a functioning registrar or call-processing server, making it impossible to initiate any new calls.

Option A is wrong because media streams (the actual voice/RTP audio) between two phones on the same system flow directly between the endpoints in a peer-to-peer path - they do not pass through the U1960. The server handles signaling, not audio packets.

Option B is wrong because signaling and media take different paths: signaling routes through U1960, while media travels directly between phones A and B.

Option C is wrong because if U1960 loses power, any active call between A and B will also be dropped - the server maintains call state and session control, so its failure terminates ongoing sessions, not just new ones.

Memory tip: Think of U1960 as an air traffic control tower - planes (media) fly directly from airport to airport without passing through the tower, but if the tower (U1960) goes dark, nothing can take off (no new calls), and planes already in the air (active calls) lose guidance and crash (calls drop).

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