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IT Certifications · 1Z0-954

Oracle Communications Session Border Controller Troubleshooting Exam Practice Test

The Oracle Communications Session Border Controller Troubleshooting Exam practice page addresses diagnosis of SIP call failures and SBC service problems. The question bank samples signaling analysis, session-agent and trunk behavior, routing by destination, resource utilization, and post-upgrade startup errors. These topics connect packet-level evidence with the SBC’s configuration and operational state.

Exam overview

Exam providerOracle
Exam code1Z0-954
CategoryIT Certifications

About the Oracle Communications Session Border Controller Troubleshooting Exam

Troubleshooting SBC traffic requires following SIP transactions and dialogs across call setup and teardown. Practice questions sample interpretation of Via branch values, Retry-After responses, 488 media-negotiation failures, and mid-call hold or resume signaling. They also address tracing BYE handling when call state differs between endpoints. Operational scenarios involve correlating CPU load with failures, gathering useful startup evidence after an upgrade, and separating destination-specific routing issues from general trunk faults. Effective analysis ties packet captures and logs to session-agent configuration, signaling flow, and resource conditions, then identifies evidence that supports a focused corrective action or escalation. Diagnostic bundles should retain relevant technical detail while protecting sensitive information.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

On an Oracle Communications Session Border Controller (SBC), what is the primary purpose of a session agent?

  1. ATo define a remote signaling peer and the parameters used to communicate with it
  2. BTo store packet captures for later analysis
  3. CTo translate media codecs between endpoints
  4. DTo assign IP addresses to endpoints
Show answerCorrect answer: A

A session agent represents a signaling peer, such as another SBC or SIP proxy, and holds settings for routing and communicating with that peer. It does not provide address assignment or packet-capture storage.

Question 2

A packet capture shows a SIP response with a Via header containing a branch parameter. What is the branch parameter primarily used for?

  1. AIdentifying a SIP transaction for request and response matching
  2. BSelecting the negotiated audio codec
  3. CIndicating the RTP destination port
  4. DProviding the caller's authentication password
Show answerCorrect answer: A

The Via branch parameter is used by SIP transaction processing to distinguish and match transactions, particularly across request forwarding and responses. Codec and media transport details are generally carried in SDP, not in the branch parameter.

Question 3

An SBC's CPU usage rises sharply during a period of call failures. Which evidence best helps determine whether processing load is contributing to the failures?

  1. ACorrelate CPU and process utilization over time with call-rate changes, alarms, and failure timestamps
  2. BInspect only the codec configured on the first successful call
  3. CChange the peer's SIP password and retry
  4. DTreat the CPU reading as unrelated unless all calls fail
Show answerCorrect answer: A

Time-correlating resource utilization with call volume and failures can reveal whether the SBC is overloaded or a particular process is consuming resources. A single snapshot is less informative than trends and aligned events.

Question 4

A SIP dialog has been established, and a participant sends a BYE. What should a troubleshooter generally verify if the other party continues to treat the call as active?

  1. AWhether the BYE reached the relevant dialog leg and received an appropriate response
  2. BWhether the original DNS lookup used TCP rather than UDP
  3. CWhether the SBC has a spare management account
  4. DWhether the SIP request included an audio codec preference
Show answerCorrect answer: A

A BYE terminates an established SIP session. Checking its delivery and response on the relevant dialog leg helps establish whether termination signaling was lost, rejected, or not relayed as expected.

Question 5

A SIP response includes a Retry-After header. What information does this header generally provide?

  1. AA suggested delay before retrying the request or service operation
  2. BThe RTP SSRC that the caller must use
  3. CThe remote peer's DNS time-to-live
  4. DThe negotiated SIP transport protocol
Show answerCorrect answer: A

Retry-After communicates a time interval after which a requester should retry, often in service-unavailable or redirection contexts. It does not specify media identifiers, DNS TTL, or transport selection.

Question 6

After a software upgrade, an SBC shows a boot or service-startup error. Which information is most useful to collect before attempting recovery?

  1. AThe exact error text, software version, startup sequence, and relevant system logs
  2. BOnly the most recent call's codec
  3. CThe caller's preferred language
  4. DA rewritten SIP display name
Show answerCorrect answer: A

Recovery decisions depend on the specific failure and the system state. Record the exact message, version, sequence of events, and relevant logs so the issue can be diagnosed without introducing additional changes or losing evidence.

Question 7

A SIP call fails after the SBC receives a 488 Not Acceptable Here response. Which investigation is most directly relevant?

  1. ACompare the offered and accepted session descriptions, including codec and media parameters
  2. BCheck whether the SBC has enough storage for archived logs
  3. CChange the DNS search domain on the management interface
  4. DVerify the NTP server's stratum
Show answerCorrect answer: A

A 488 response commonly indicates that the request's session description was unacceptable. Comparing SDP offers and answers can reveal incompatible codecs or other media parameters. The response should be interpreted in the context of the peer and call trace.

How to use this practice test

Access is free. A session presents up to 20 random questions from the 50-question practice bank, sampling SIP signaling and SBC troubleshooting scenarios. Results appear after the session, so use them to identify which evidence, headers, or call-flow decisions need another review.

Preparation tips

  • Trace a SIP transaction through request and response messages; note how the Via branch value helps correlate transactions.
  • For 488 and failed hold or resume scenarios, compare SDP offers and answers, media attributes, and the signaling sequence before and after the failure.
  • When a BYE does not clear call state, map the dialog identifiers and verify whether both endpoints and the SBC process the termination exchange.
  • For destination-specific trunk failures, compare routing results and session-agent selection for a working destination and a failing one.
  • Practice correlating CPU or startup symptoms with timestamps, logs, and packet captures; redact sensitive values before preparing escalation evidence.
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