The administrator of ABC company is troubleshooting a one-way audio issue for a call that uses H.323 protocol (slow-start mode). The administrator requests that you provide the IP and port information of the Real-Time Transport Protocol traffic that had the one-way audio call. You gather the H.225 and H.245 messages for one of the one-way audio calls. Where can you find the RTP IP and port information for both sides? (Note: This call flow has not invoked any media resources like MTP or transcoders).
H.245 Terminal Capability Set
H.245 Open Logical Channel
H.225 Connect
H.245 Open Logical Channel Ack
Show answer and explanation
Correct answer: D. H.245 Open Logical Channel Ack
In H.323 slow start, each endpoint opens a logical channel with an Open Logical Channel message. The receiving side answers with an Open Logical Channel Ack that contains the IP address and port where it wants to receive RTP. Because each direction has its own OLC Ack, the Acks give the RTP address and port for both sides.
Why the other options are wrong
A. Terminal Capability Set exchanges supported codecs, not media addresses.
B. The Open Logical Channel carries the RTCP control address, while the RTP address comes in the Ack.
C. H.225 Connect in slow start does not carry media addresses.
Question 2
Which two extended capabilities must be configured on dial peers for fast start-to-early media scenarios (H.323 to SIP interworking)? (Choose two.)
DTMF
BFCP
VIDEO
FAX
AUDIO
Show answer and explanation
Correct answer: A, D. DTMF; FAX
For H.323 to SIP interworking in fast start-to-early media scenarios, DTMF and AUDIO extended capabilities must be configured on dial peers. DTMF capability ensures proper digit signaling interoperability, and AUDIO capability is essential for establishing and maintaining voice media streams between the different protocol domains during early media exchange.
Why the other options are wrong
B. BFCP (Binary Floor Control Protocol) is not a required extended capability for basic H.323 to SIP interworking in early media scenarios.
C. VIDEO capability is not a standard extended capability requirement for H.323 to SIP interworking in fast start scenarios.
E. While audio is critical, AUDIO as a standalone extended capability configuration is subsumed within the DTMF and core interworking capabilities.
Question 3
When you troubleshoot H.323 call setup, which message informs you that the called party is being notified about the call?
ALERTING
PROCEEDING
CONNECT
RINGING
Show answer and explanation
Correct answer: A. ALERTING
The ALERTING message in H.323 signaling informs the originating party that the called party is being notified about the incoming call. This message indicates that the called endpoint has received the call setup request and is alerting the user, typically by ringing or other notification means.
Why the other options are wrong
B. PROCEEDING indicates that the call is being processed but does not specifically indicate that the called party is being notified.
C. CONNECT is sent when the called party has answered the call and establishes the connection, not when they are merely being notified.
D. RINGING is not a standard H.323 protocol message; ALERTING serves this function in the H.323 protocol stack.
1 review for Cisco 300-815 CLACC Exam Practice Questions
Rated 4 out of 5
Richard –
The guide provides great study material. It helped me to get started on studying for the Cisco 300-815 exams. Great dumps!
Only logged in customers who have purchased this product may leave a review.
How much of the Cisco 300-815 CLACC bank is free?
245 questions in the bank
Each step includes the one before, so buying only adds new questions.
You are here10questionsFree sampleThree on this page, all ten as a PDF.Download the sample
6125% of the bankPractice pageFree on the site, every answer explained.Go to the practice page
113the first half of the packHalf PackFree by email, as one PDF, every answer explained.Get the Half Pack
245100%, the whole bankFull pack, US$39Plus the questions-only PDF, monthly updates, refund if you fail.Get the full pack
ABOUT THIS PACK
What’s in the Cisco 300-815 CLACC pack
245 questions across all five CLACC domains
Answers and explanations for every question, including the wrong options
A questions-only PDF for timed practice runs
Delivered by email shortly after checkout
Free monthly updates for as long as the exam is live
Pass or your money back
A failed 300-815 attempt costs another US$300. This pack is US$39, paid once, and refunded if you fail.
What makes the CLACC hard
300-815 kept its number but not its name. The v1.2 exam was CLACCM, Advanced Call Control and Mobility Services. The v2.0 exam that replaced it in February 2026 is CLACC, Advanced Call Control On-Premises, and the domains were rebuilt: mobility was folded into supplemental features, business-to-business joined remote connectivity, and the session border controller domain grew to nearly a third of the exam.
Session Border Controller and Voice Gateway Technologies is 30%: UCME and SIP SRST, troubleshooting CUBE dial plans, DTMF interop, SIP profiles, TLS profiles and SRTP, and dial peer groups. Advanced Call Control at 25% covers SIP normalisation in UCM, SIP trunk security profiles, and troubleshooting globalised routing. Supplemental features and security adds certificate trust stores, secure phone registration, hunt groups, Unified Mobility and Extension Mobility, plus GDPR. Remote connectivity is MRA configuration and troubleshooting, Expressway media traversal, TLS and mTLS, and B2B troubleshooting. Signalling protocols opens the exam at 10% with PRACK, UPDATE, STUN, TURN and ICE.
About the exam
300-815 (Implementing Cisco Advanced Call Control On-Premises v2.0, CLACC) earns the Cisco Certified Specialist, Collaboration Call Control and Mobility Implementation certification and counts as a concentration exam for CCNP Collaboration. It covers SIP signalling and media, CUBE and voice gateway technologies, advanced UCM call control, supplemental features, security and mobility, and MRA, Expressway and business-to-business solutions. No prerequisites.
Questions before you buy
How quickly do I receive it?
Your PDF is prepared and sent to your email address after checkout, and you get a confirmation as soon as it is on its way.
Are updates included?
Yes. The pack is updated every month for as long as the exam is live, and updates are free for everyone who has bought it.
What if I fail the exam?
We refund the pack, or swap it for any other pack if you would rather keep studying. Sit the exam 7 to 30 days after buying, then send your official score report within 7 days of the exam date, as set out in the refund policy.
What is your pass rate?
99% of customers who prepare with a CertStash pack pass. If you do not, we refund the pack, or swap it for another pack.
Can I share it with colleagues?
Each purchase is licensed to one person. For a team, school or training organisation, email support@certstash.com for a licence that fits.
Richard –
The guide provides great study material. It helped me to get started on studying for the Cisco 300-815 exams. Great dumps!