When viewing a SIP Station Registration, what is the expected behaviour?

Question

Options

• AThe first registration request is rejected with a 401 Unauthorized message.
• BThe first registration request is successful if the correct password has been entered.
• COnly Advanced SIP Telephony (AST) device registrations are shown on traceSM.
• DTraceSM does not show successful SIP Station Registrations, it only displays registration failures.

• A
  7% (2)
• B
  87% (26)
• C
  3% (1)
• D
  3% (1)

Explanation

Option B is correct because in a properly configured SIP station registration, when a device presents the correct credentials on its initial REGISTER request, the server accepts it immediately with a 200 OK response - this is the expected, normal outcome of a successful registration.

Why the distractors are wrong:

• A describes the SIP digest authentication challenge-response flow (RFC 3261), where a 401 is sent as a challenge before credentials are submitted. This is a two-step handshake scenario, not the expected behavior when credentials are pre-provisioned and correct - and calling it "rejected" mischaracterizes the challenge as a failure.
• C is wrong because TraceSM monitors all SIP station registrations, not just Advanced SIP Telephony (AST) devices - there is no such filter restriction.
• D is wrong because TraceSM displays both successful and failed registrations; limiting it to failures only would defeat its purpose as a diagnostic and monitoring tool.

Memory tip: Think "B = Basic success" - if you did everything By the book (correct password, correct config), the first attempt works. Any other answer describes either a broken flow, a missing feature, or a misunderstood protocol step.

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