Analog phone A registers with a U1960 unified gateway through the IAD proxy. IP phone B also registers with the U1960. If the U1960 encounters an unexpected power failure when A and B are engaged in…

Question

Options

• ATRUE
• BFALSE

• A
  22% (8)
• B
  78% (28)

Explanation

Option B is correct because in most unified gateway architectures, once a call is fully established, the voice media (RTP stream) flows directly between the endpoints - in this case, between the analog phone A's IAD and IP phone B - rather than continuously passing through the U1960. A sudden power failure on the U1960 disrupts signaling control, but the already-established media path can remain active, meaning the call continues rather than dropping immediately. The call will eventually terminate when a session timer expires, a re-INVITE fails, or an endpoint attempts a control action (hold, transfer) that requires the gateway.

Option A (TRUE) is wrong because it conflates the signaling plane with the media plane: losing the call controller does not instantly tear down a voice stream that is already in progress between endpoints.

Memory tip: Think of the gateway as a switchboard operator - once the operator connects your call, you can keep talking even if the operator steps away. The gateway sets up the call, but the voice travels on its own path.

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