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Training SSSP Certification Exam Guide
Question 1. Which market trend most directly drives organizations to replace legacy TDM/PBX systems with SIP‑based solutions? A) Decline of PSTN/ISDN B) Increase in on‑premise server capacity C) Growth of analog handset sales D) Rise of fax‑over‑IP Answer: A Explanation: The worldwide phase‑out of PSTN/ISDN makes traditional circuit‑switched PBXs obsolete, prompting migration to IP‑based SIP infrastructures. Question 2. In a typical SIP transaction, which method is used by the caller’s device to initiate a call? A) BYE B) ACK C) INVITE D) CANCEL Answer: C Explanation: INVITE establishes a session request, signaling the desire to start a voice or video call. Question 3. What is the primary benefit of moving from a CapEx to an OpEx financial model in communications? A) Higher upfront hardware costs B) Predictable monthly subscription fees C) Increased need for on‑site maintenance staff D) Longer contract renewal cycles
Training SSSP Certification Exam Guide
Answer: B Explanation: OpEx replaces large capital purchases with recurring, predictable expenses, aligning costs with usage. Question 4. Which SIP response code indicates that the request was successful and the call is now established? A) 180 Ringing B) 200 OK C) 404 Not Found D) 503 Service Unavailable Answer: B Explanation: 200 OK is a final success response confirming that the called party has accepted the INVITE. Question 5. In a hybrid deployment (cloud + on‑premise), what component typically bridges legacy hardware to the SIP cloud? A) Session Border Controller (SBC) B) Media Gateway C) DNS Server D) DHCP Server Answer: B Explanation: Media gateways convert TDM signaling to SIP, allowing existing PBX equipment to interface with cloud services. Question 6. Which codec provides the highest voice quality but consumes the most bandwidth?
Training SSSP Certification Exam Guide
Question 9. Which CPaaS use case most commonly utilizes short‑message service (SMS) for two‑factor authentication? A) Embedded video conferencing B) Voice‑enabled IVR C) OTP delivery to mobile devices D) Call‑center queue callbacks Answer: C Explanation: CPaaS APIs enable sending one‑time passwords via SMS to verify user identities. Question 10. When evaluating network readiness for SIP, which metric most directly affects voice clarity? A) Bandwidth capacity B) Packet loss percentage C) Number of concurrent users D) CPU clock speed Answer: B Explanation: Packet loss degrades audio packets, causing gaps and distortion; latency and jitter affect timing but not the actual clarity as directly as loss does. Question 11. Which security function of an SBC protects against Denial‑of‑Service attacks targeting SIP trunks? A) Media transcoding B) DDoS mitigation C) Call admission control D) QoS policing
Training SSSP Certification Exam Guide
Answer: B Explanation: SBCs can detect and block high‑volume malicious traffic, preventing DDoS attacks from overwhelming the SIP infrastructure. Question 12. Which SIP URI format correctly identifies a user on a remote domain? A) sip:[email protected] B) sip:[email protected] C) sip:[email protected] D) sip:[email protected] Answer: D Explanation: The SIP URI follows the pattern sip:user@domain, where the domain part specifies the SIP server domain. Question 13. What does the SIP method OPTIONS primarily test? A) Network latency B) Server capabilities C) Call routing paths D) Authentication credentials Answer: B Explanation: OPTIONS requests query the capabilities of a SIP endpoint, such as supported methods and codecs. Question 14. Which of the following is a provisional (1xx) SIP response code? A) 180 Ringing B) 200 OK C) 301 Moved Permanently
Training SSSP Certification Exam Guide
Question 17. Which component is essential for providing geographic redundancy in a SIP trunking deployment? A) Single‑site media gateway B) Multi‑site SBC cluster C) Single‑site router D) VPN concentrator Answer: B Explanation: Deploying multiple SBCs in different data centers ensures calls can be rerouted if one site fails, delivering geographic redundancy. Question 18. What does the term “on‑demand capacity” refer to in SIP cloud services? A) Fixed number of concurrent sessions B) Ability to provision new trunks instantly as traffic grows C) Pre‑allocated hardware slots D) Static licensing model Answer: B Explanation: On‑demand capacity means the provider can dynamically allocate additional SIP trunks when the customer’s usage spikes. Question 19. Which SIP method is used to terminate an established call? A) INVITE B) BYE C) CANCEL D) REGISTER Answer: B Explanation: BYE ends an active dialog, signaling both parties to release the session.
Training SSSP Certification Exam Guide
Question 20. In a SIP‑based contact center, which term describes the ability to route a call to an agent based on the caller’s language preference? A) Language Preference Routing (LPR) B) Multilingual IVR C) Voice‑to‑Text (VTT) D) Call‑Back Queue Answer: A Explanation: LPR uses the caller’s language selection (often passed via SIP header “Accept‑Language”) to route the call to the appropriate language‑specific queue. Question 21. Which security protocol encrypts both signaling and media streams in SIP? A) TLS for signaling only B) SRTP for media only C) TLS + SRTP combined D) IPsec tunneling Answer: C Explanation: TLS protects SIP messages; SRTP encrypts RTP media. Using both together secures the entire communication. Question 22. Which of the following is a typical SLA uptime commitment for a Tier‑1 SIP provider? A) 99.9% B) 99.99% C) 99.999% D) 99.9999%
Training SSSP Certification Exam Guide
B) G.
C) G.
D) Opus (64 kbps) Answer: C Explanation: G.729 compresses audio to 8 kbps, making it ideal for limited bandwidth scenarios. Question 26. In a SIP‑based sales conversation, which question best uncovers hidden maintenance costs? A) “How many phones are you currently replacing?” B) “What is your current annual maintenance budget?” C) “What are your existing... D) “Do you have any... Answer: B Explanation: Asking directly about the maintenance budget surfaces the hidden OPEX that the client may be paying. Question 27. Which deployment model allows a customer to keep existing analog phones while moving to SIP? A) Full replacement only B) Hybrid (cloud + on‑prem) C) Parallel migration D) Total replacement Answer: B
Training SSSP Certification Exam Guide
Explanation: A hybrid model retains analog endpoints and connects them via a media gateway to the SIP cloud. Question 28. Which KPI is most commonly used to justify the ROI of a SIP migration project? A) Net Present Value (NPV) B) Internal Rate of Return (IRR) C) Payback Period D) Cost‑Benefit Ratio Answer: C Explanation: The Payback Period indicates how quickly the investment is recovered, a frequent metric in sales proposals. Question 29. Which SIP response code indicates that the user is not authorized to use the requested resource? A) 401 Unauthorized B) 403 Forbidden Answer: B Explanation: 403 Forbidden tells the caller that the request is understood but the user lacks permission. Question 30. In a cloud‑based SIP trunk, which transport protocol is most commonly used to carry RTP packets over the public internet? A) UDP
Training SSSP Certification Exam Guide
Answer: C Explanation: Business continuity is the core reason organizations move to SIP. Question 33. Which SIP method is used to cancel a pending INVITE before the callee answers? A) CANCEL B) BYE Answer: A Explanation: CANCEL aborts a half‑completed INVITE transaction. Question 34. Which SIP response code indicates a redirect to a new destination? A) 300 Multiple Choices B) 301 Moved Permanently Answer: B Explanation: 301 Moved Permanently tells the caller that the requested resource resides at a new URI. Question 35. Which SIP response code indicates a server error that is temporary? A) 500 Internal Server Error B) 503 Service Unavailable Answer: B Explanation: 503 signals a temporary condition; the request cannot be processed at this time.
Training SSSP Certification Exam Guide
Question 36. Which type of QoS policy tags voice packets with the highest priority? A) DSCP 46 (EF) B) DSCP 24 (AF21) C) DSCP 34 (AF31) D) DSCP 56 Answer: A Explanation: DSCP 46 (EF) is the highest‑priority voice class. Question 37. Which compliance framework specifically addresses the recording of telephone calls for healthcare? A) HIPAA B) GDPR C) PCI‑DSS D) ISO 27001
Training SSSP Certification Exam Guide
D) CANCEL
Answer: A Explanation: REGISTER informs the registrar of the device’s current SIP URI. Question 40. Which SIP URI component identifies the user portion? A) sip:username@domain B) sip:domain C) sip:username D) sip:@domain Answer: A Explanation: The part before the “@” is the user identifier. Question 41. In a SIP‑based contact center, which AI capability is used to predict call‑volume spikes? A) Sentiment analysis B) Forecasting
Training SSSP Certification Exam Guide
C) Predictive analytics D) Predictive routing Answer: C Explanation: Predictive analytics uses historical data to forecast future call volumes. Question 42. Which security feature of an SBC encrypts SIP signaling while leaving media unencrypted? A) TLS B) SRTP C) DTLS D) None Answer: A Explanation: TLS secures the SIP messages; the media remains in clear unless SRTP is also deployed. Question 43. Which metric is most commonly used to compare on‑premise licensing cost vs. subscription cost?
Training SSSP Certification Exam Guide
B) Protocol conversion between TDM and SIP C) Call accounting D) Billing aggregation Answer: B Explanation: The media gateway converts legacy TDM signaling to SIP. Question 46. In a SIP‑based migration, which KPI is most often used to measure voice quality during a live call? A) MOS (Mean Opinion Score) B) R‑Factor Answer: A Explanation: MOS provides a subjective quality rating from 1 to 5. Question 47. Which SIP response code indicates a request was denied because the user is not authorized? A) 401 Unauthorized
Training SSSP Certification Exam Guide
B) 403 Forbidden Answer: A Explanation: 401 signals that the user is not authorized. Question 48. Which SIP response code indicates that the request was successful but the resource is no longer available? A) 410 Gone B) 410 Answer: A Explanation: 410 Gone tells the caller the resource has been removed. Question 49. Which SIP method is used to probe the capabilities of a remote endpoint? A) OPTIONS B) INFO Answer: A Explanation: OPTIONS is the standard capability‑probe request.
